{"title":"RV Tank Fittings \u0026 Parts","description":"","products":[{"product_id":"cpi-3-inch-hub-adaptor-o-ring-3-75-hole-size-part-300","title":"CPI - 3\" Hub Adaptor with O Ring - 3.75\" Hole Size - Part # 300","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 16px; margin-bottom: 16px;\"\u003e\n  \u003cp style=\"margin: 0; color: #1d9bf0; font-weight: bold;\"\u003e✓ ElkhartRVParts.com - The Only Authorized Place for CPI Parts\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 16px; margin-bottom: 20px;\"\u003e\n  \u003cp style=\"margin: 0; color: #10b981; font-weight: bold;\"\u003e✓ 100% Verified Authentic OEM Grade Part\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eCPI 3\" Hub Adaptor with O Ring (Part # 300)\u003c\/strong\u003e is the professional-grade solution for creating secure, leak-free connections on RV holding tanks and fresh water systems. Designed for 3.75\" hole sizes, this hub adaptor features an integrated O-ring seal that ensures reliable performance in demanding mobile environments where vibration and temperature changes are constant challenges.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Fit:\u003c\/strong\u003e Engineered for 3.75\" (3 3\/4\") hole size with exact tolerances for proper sealing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated O-Ring Seal:\u003c\/strong\u003e Pre-installed O-ring provides superior leak protection compared to gasket-only designs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Grade Construction:\u003c\/strong\u003e Manufactured by CPI (Elkhart Plastics) to original equipment specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Materials:\u003c\/strong\u003e High-impact plastic construction resists cracking, UV damage, and chemical exposure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Design:\u003c\/strong\u003e Only 0.8 lbs for easy handling during installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Works with standard 3\" plumbing connections on RV tanks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number 300 (500288):\u003c\/strong\u003e Direct OEM replacement for factory-installed fittings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the CPI 3\" Hub Adaptor with O Ring?\u003c\/h2\u003e\n\u003cp\u003eWhen you're replacing or upgrading RV tank fittings, the quality of your hub adaptor directly impacts system reliability. The \u003cstrong\u003eCPI 3\" Hub Adaptor with O Ring\u003c\/strong\u003e eliminates common failure points found in inferior fittings. The integrated O-ring design creates a compression seal that maintains integrity even as your RV travels over rough roads. Unlike cheaper alternatives that rely solely on threaded connections, this hub adaptor's O-ring provides a secondary seal that prevents leaks before they start. CPI's reputation for manufacturing OEM-grade RV components means you're installing the same quality fitting that RV manufacturers trust in new production.\u003c\/p\u003e\n\n\u003ch2\u003eCompare 3\" RV Tank Fittings\u003c\/h2\u003e\n\u003cp\u003eChoosing the right tank fitting depends on your hole size, installation method, and sealing requirements. Here's how the CPI Hub Adaptor compares to other popular 3\" fittings:\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x: auto; margin: 20px 0;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e5e7eb;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color: #dc2626; color: white;\"\u003e\n      \u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eModel (Part #)\u003c\/th\u003e\n      \u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eHole Size\u003c\/th\u003e\n      \u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eSeal Type\u003c\/th\u003e\n      \u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eMaterial\u003c\/th\u003e\n      \u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n      \u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eView Details\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background-color: #fef2f2; border-left: 3px solid #dc2626;\"\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCPI Hub Adaptor (300)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e3.75\"\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eIntegrated O-Ring\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eHigh-Impact Plastic\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eStandard tank connections requiring secure O-ring seal\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cem\u003eCurrent Product\u003c\/em\u003e\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCPI Flex Rubber (93)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e3.875\"\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFlexible Rubber Gasket\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eBlack Rubber\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eApplications needing flexibility and vibration dampening\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/cpi-3-flex-black-rubber-tank-fitting-3-7-8-hole-size-part-93-500125\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eICON Threaded Flush (HW\/SLF-300)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eVaries\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eThreaded Connection\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eABS Plastic\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFlush-mount threaded applications\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/icon-fitting-threaded-3-inch-flush-hwslf-300\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eICON Spigot (HW\/SLF-400)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eVaries\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eSpigot Connection\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eABS Plastic\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eSpigot-style drain connections\u003c\/td\u003e\n      \u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/icon-fitting-spigot-3-inch-hwslf-400\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"background-color: #f3f4f6; padding: 12px; border-left: 3px solid #dc2626; margin: 20px 0;\"\u003e\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Always measure your existing hole size before ordering. The 3.75\" hole size is standard for many RV tanks, but verify your specific application to ensure proper fit.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 300 (also known as 500288)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e CPI (Elkhart Plastics)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection Size:\u003c\/strong\u003e 3\" hub diameter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired Hole Size:\u003c\/strong\u003e 3.75\" (3 3\/4\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Dimensions:\u003c\/strong\u003e 3\" diameter hub\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.8 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-impact plastic with integrated O-ring seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Standard tank fitting color\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e RV holding tanks, fresh water tanks, gray water systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Requires 3.75\" hole saw for new installations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Standard 3\" plumbing connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x CPI 3\" Hub Adaptor (Part # 300)\u003c\/li\u003e\n\u003cli\u003e1x Pre-installed O-Ring seal\u003c\/li\u003e\n\u003cli\u003eManufacturer's quality guarantee\u003c\/li\u003e\n\u003cli\u003eOEM-grade construction for reliable performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Models \u0026amp; Alternatives\u003c\/h2\u003e\n\u003cp\u003eThis hub adaptor works with any RV tank requiring a 3.75\" hole fitting. If you need a different hole size, consider the \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/cpi-3-flex-black-rubber-tank-fitting-3-7-8-hole-size-part-93-500125\" style=\"color: #dc2626; font-weight: bold;\"\u003eCPI 3\" Flex Black Rubber Tank Fitting (Part # 93)\u003c\/a\u003e for 3.875\" holes, or browse our complete \u003ca href=\"https:\/\/elkhartrvparts.com\/collections\/rv-tank-fittings\" style=\"color: #dc2626; font-weight: bold;\"\u003eRV Tank Fittings Collection\u003c\/a\u003e for other sizes and styles.\u003c\/p\u003e\n\n\u003cp\u003eNeed to replace just the O-ring? We also carry the \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/o-ring-only-for-3-hub-adaptor-3-3-4-hole-size-part-300-oring\" style=\"color: #dc2626; font-weight: bold;\"\u003eO-Ring ONLY for 3\" Hub Adaptor (Part # 300-O'RING)\u003c\/a\u003e for maintenance and repairs.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eHow do I install the CPI 3\" Hub Adaptor?\u003c\/h3\u003e\n\u003cp\u003eInstallation requires a 3.75\" hole in your tank wall. Insert the hub adaptor from the inside of the tank, ensuring the O-ring is properly seated. Secure from the outside using the appropriate threaded connection or clamp. Always test for leaks before putting the tank into service.\u003c\/p\u003e\n\n\u003ch3\u003eIs this compatible with my RV's holding tank?\u003c\/h3\u003e\n\u003cp\u003eThis hub adaptor fits any RV tank with a 3.75\" hole size and 3\" plumbing connections. It's a universal OEM-grade fitting used by many RV manufacturers. Measure your existing hole or check your tank specifications to confirm compatibility.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's the difference between this and the rubber flex fitting?\u003c\/h3\u003e\n\u003cp\u003eThe hub adaptor (Part # 300) uses a rigid plastic construction with an integrated O-ring seal, ideal for standard installations. The flex rubber fitting (Part # 93) offers more flexibility and vibration dampening but requires a slightly larger 3.875\" hole. Choose based on your specific installation requirements.\u003c\/p\u003e\n\n\u003ch3\u003eCan I replace just the O-ring if it wears out?\u003c\/h3\u003e\n\u003cp\u003eYes, replacement O-rings are available separately as Part # 300-O'RING. Regular O-ring replacement during routine maintenance can extend the life of your hub adaptor and prevent leaks.\u003c\/p\u003e\n\n\u003ch3\u003eWhat tools do I need for installation?\u003c\/h3\u003e\n\u003cp\u003eFor new installations, you'll need a 3.75\" hole saw. For replacements, basic hand tools to remove the old fitting and install the new one. Always follow proper safety procedures when working with tank systems.\u003c\/p\u003e\n\n\u003ch3\u003eIs this fitting suitable for fresh water tanks?\u003c\/h3\u003e\n\u003cp\u003eYes, the CPI 3\" Hub Adaptor is suitable for fresh water, gray water, and black water holding tanks. The materials are safe for potable water applications and resistant to the chemicals used in RV sanitation systems.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Elkhart RV Parts?\u003c\/h2\u003e\n\u003cp\u003eElkhart RV Parts is your trusted source for authentic OEM-grade RV components. We stock only verified genuine parts from authorized manufacturers like CPI (Elkhart Plastics). Every hub adaptor we sell meets or exceeds original equipment specifications. Our team understands RV systems and can help you find the right parts for your specific application. We offer fast shipping, secure packaging, and a satisfaction guarantee on all products.\u003c\/p\u003e\n\n\u003cdiv style=\"background-color: #fef2f2; border-left: 4px solid #dc2626; padding: 16px; margin-top: 20px;\"\u003e\n  \u003cp style=\"margin: 0; font-weight: bold; color: #dc2626;\"\u003eReady to Install a Reliable Tank Fitting?\u003c\/p\u003e\n  \u003cp style=\"margin: 8px 0 0 0;\"\u003eOrder your CPI 3\" Hub Adaptor today and enjoy secure, leak-free performance. Have questions? Our AI Live Chat is available to help you find the perfect fitting for your RV tank system.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789634383931,"sku":"300","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/cpi-3-inch-hub-adaptor-o-ring-3-75-hole-size-part-300-shopify-1.jpg?v=1779179935"},{"product_id":"rv-tank-fittings1-2-spin-probe-1-2-hole-size","title":"1\/2\" Spin Probe 1\/2\" Hole Size Part # 350","description":"\u003cp\u003e1\/2\" Spin Probe\u003c\/p\u003e\n\u003cp\u003ePart # 350 (500133)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789634515003,"sku":"350","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings1-2-spin-probe-1-2-hole-size-shopify-1.jpg?v=1779181379"},{"product_id":"rv-tank-fittings1-2-spin-fpt-7-8-hole-size","title":"1\/2\" Spin FPT  7\/8\" Hole size Part # 53","description":"\u003cp\u003e1\/2\" Spin Fitting\u003c\/p\u003e\n\u003cp\u003ePart # 53 (500104)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789634809915,"sku":"53","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings1-2-spin-fpt-7-8-hole-size-shopify-1.jpg?v=1779181229"},{"product_id":"rv-tank-fittings2-raised-fitting-2-1-2-hole-size","title":"2\" Raised fitting 2 1\/2\" Hole Size Part # 65M","description":"\u003cp\u003e2\" Raised fitting 2 1\/2\" Hole Size\u003c\/p\u003e\n\u003cp\u003ePart # 65M (500502)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789634973755,"sku":"65M","price":4.99,"currency_code":"USD","in_stock":true}]},{"product_id":"rv-tank-fittings1-2-flush-fitting-1-1-8-hole-size","title":"1\/2\"  FPT Flush Fitting 1 1\/8\" Hole Size Part # 83-LL","description":"\u003cp\u003e1\/2\" FPT (threaded) Flush Fitting (Cut hole size:1 1\/8\")\u003c\/p\u003e\n\u003cp\u003eCPI Part # 83 (500103)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789635235899,"sku":"83-LL","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings1-2-flush-fitting-1-1-8-hole-size-shopify-1.jpg?v=1779181165"},{"product_id":"rv-tank-fittings1-1-2-barb-fill-fitting-1-5-8-hole-size","title":"1-3\/8\" OD x 1-1\/8 ID Non-Thread Fitting Fill Fitting Part # 62","description":"\u003cp\u003eCustom Plastics Part # 62 (500152)\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1-3\/8\" OD x 1-1\/8 ID Non-Thread Fitting\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpin Weld Fitting for RV Fresh Water and Holding Tanks\u003c\/span\u003e\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789638512699,"sku":"62","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings1-1-2-barb-fill-fitting-1-5-8-hole-size-shopify-1.jpg?v=1779181287"},{"product_id":"rv-tank-fittings1-1-4-spig-spin-fitting-1-1-2-hole-size","title":"1-1\/4\" Spigot Spinweld Fitting - Part # 61","description":"\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e1\/4\" OD x 1\" ID Fill \u003c\/span\u003eSpigot Spinweld Fitting (1 1\/2\" Hole Size)\u003c\/p\u003e\n\u003cp\u003eCustom Plastics Part # 61 (500121)\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpin Weld Fitting for RV Fresh Water and Holding Tanks\u003c\/span\u003e\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789638643771,"sku":"61\/500121","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings1-1-4-spig-spin-fitting-1-1-2-hole-size-shopify-1.jpg?v=1779181206"},{"product_id":"rv-tank-fittingsslip-fleetwood-fill-fitting-1-1-2-hole-size","title":"Slip\/Fleetwood Fill Fitting 1 1\/2\" Hole Size 500236","description":"Slip\/Fleetwood Fill Fitting (1 1\/2\" Hole Size)","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789639069755,"sku":"500236","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittingsslip-fleetwood-fill-fitting-1-1-2-hole-size-shopify-1.jpg?v=1779181609"},{"product_id":"cpi-1-1-4-flush-fpt-spinweld-fitting-membrane-55m","title":"CPI - 1 1\/4\" Flush FPT Spinweld Fitting w\/Membrane 2\" Hole Size Part # 55M","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 15px; margin-bottom: 15px;\"\u003e\u003cp style=\"margin: 0; color: #1d9bf0; font-weight: bold;\"\u003e\u003cstrong\u003e✓ ElkhartRVParts.com - The Only Authorized Place for CPI Parts\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #10b981; font-weight: bold;\"\u003e\u003cstrong\u003e✓ 100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\u003ch2\u003eCPI 1 1\/4\" Flush FPT Spinweld Fitting w\/Membrane - Part # 55M (500153)\u003c\/h2\u003e\u003cp\u003eThe CPI Part # 55M is a professional-grade 1 1\/4 inch flush female pipe thread spinweld fitting designed specifically for RV fresh water and holding tank installations. This fitting includes an integrated membrane seal for superior leak protection and is engineered for 2 inch hole size applications. Trusted by RV manufacturers and service professionals, this authentic CPI fitting delivers reliable performance in demanding mobile environments.\u003c\/p\u003e\u003ch2\u003eWhy Choose This CPI Spinweld Fitting\u003c\/h2\u003e\u003cp\u003eThis flush-mount FPT spinweld fitting combines precision engineering with durable construction to provide long-lasting tank connections. The included membrane creates a watertight seal that prevents leaks and contamination, while the flush design sits cleanly against your tank surface for a professional installation. With a proven 4.9-star rating from verified customers, this fitting is the trusted choice for RV tank repairs and new installations.\u003c\/p\u003e\u003ch3\u003eKey Features \u0026amp; Benefits\u003c\/h3\u003e\u003cp\u003ePremium membrane seal technology ensures leak-free operation in fresh water and holding tank applications. The 1 1\/4 inch female pipe thread accepts standard plumbing connections, while the spinweld installation method creates a permanent, vibration-resistant bond to your tank. The flush-mount design minimizes protrusion and reduces the risk of damage during travel. Manufactured by CPI (Custom Plastics), this fitting meets OEM specifications for quality and durability.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e 55M, 500153\u003cbr\u003e\u003cstrong\u003eThread Size:\u003c\/strong\u003e 1 1\/4 inch FPT (Female Pipe Thread)\u003cbr\u003e\u003cstrong\u003eFitting Style:\u003c\/strong\u003e Flush mount\u003cbr\u003e\u003cstrong\u003eInstallation Method:\u003c\/strong\u003e Spinweld\u003cbr\u003e\u003cstrong\u003eHole Size Required:\u003c\/strong\u003e 2 inches\u003cbr\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-grade plastic with integrated membrane\u003cbr\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e RV fresh water tanks, RV holding tanks\u003cbr\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e CPI (Custom Plastics)\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 10 oz\u003c\/p\u003e\u003ch3\u003eCompatible Applications \u0026amp; Use Cases\u003c\/h3\u003e\u003cp\u003eThis versatile spinweld fitting is ideal for RV fresh water tank drain connections, holding tank outlet fittings, tank vent installations, and general plumbing connections requiring a 1 1\/4 inch female thread. The 2 inch hole size makes it compatible with standard RV tank installations. Perfect for motorhome repairs, travel trailer upgrades, fifth wheel maintenance, and camper restoration projects. Professional RV technicians and DIY enthusiasts rely on this fitting for permanent tank repairs and new construction.\u003c\/p\u003e\u003ch2\u003eCompare Similar Spinweld Fittings\u003c\/h2\u003e\u003cdiv style=\"overflow-x: auto; margin: 20px 0;\"\u003e\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e5e7eb;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background-color: #dc2626; color: white;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eThread Size\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eStyle\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eHole Size\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003ePart Number\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #fef2f2; border-left: 4px solid #dc2626;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: bold;\"\u003ePart # 55M\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1 1\/4\" FPT\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFlush w\/Membrane\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e55M \/ 500153\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eLeak-proof tank connections\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCurrent Product\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: white;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003ePart # 55\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1 1\/4\" FPT\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eThreaded (No Membrane)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e55\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eStandard installations\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings1-1-4-fitting-2-hole-size\" style=\"color: #dc2626; text-decoration: none; font-weight: bold;\"\u003eView Details →\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: white;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003ePart # 57M\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1 1\/2\" FPT\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFlush w\/Membrane\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2 1\/4\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e57M\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eLarger diameter needs\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings1-1-2-flush-with-membrane-2-1-4-hole-size\" style=\"color: #dc2626; text-decoration: none; font-weight: bold;\"\u003eView Details →\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: white;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003ePart # 56\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1 1\/2\" FPT\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eThreaded (No Membrane)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e56\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eLarger standard fittings\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings1-1-2-fpt-fitting-2-hole-size\" style=\"color: #dc2626; text-decoration: none; font-weight: bold;\"\u003eView Details →\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 12px; margin-top: 15px;\"\u003e\u003cstrong\u003e💡 Helpful Tip:\u003c\/strong\u003e Choose membrane-style fittings (like Part # 55M) for critical connections where leak prevention is essential, such as fresh water tank drains and holding tank outlets. Standard threaded fittings work well for vent lines and less critical applications.\u003c\/p\u003e\u003ch3\u003eRelated Products \u0026amp; Complete Your Installation\u003c\/h3\u003e\u003cp\u003ePair this fitting with our complete selection of \u003ca href=\"https:\/\/elkhartrvparts.com\/collections\/rv-tank-fittings\" style=\"color: #dc2626; font-weight: bold;\"\u003eRV tank fittings and parts\u003c\/a\u003e for a professional installation. Browse our full range of \u003ca href=\"https:\/\/elkhartrvparts.com\/collections\/spinweld-parts\" style=\"color: #dc2626; font-weight: bold;\"\u003espinweld parts and tank fittings\u003c\/a\u003e to find compatible components for your RV plumbing system.\u003c\/p\u003e\u003ch3\u003eInstallation \u0026amp; Professional Support\u003c\/h3\u003e\u003cp\u003eSpinweld fittings require specialized installation equipment for proper bonding to tank surfaces. For installation guidance, technical specifications, or product compatibility questions, our AI Live Chat provides instant access to deep product knowledge and expert assistance. Get answers to your questions in real-time without waiting.\u003c\/p\u003e\u003ch2\u003eAuthentic CPI Quality You Can Trust\u003c\/h2\u003e\u003cp\u003eEvery CPI fitting sold through Elkhart RV Parts is 100% authentic OEM-grade product sourced directly from authorized suppliers. We stand behind the quality of every part with our commitment to verified authenticity and customer satisfaction. With an average rating of 4.9 stars from verified customers, this fitting has proven its reliability in real-world RV applications.\u003c\/p\u003e\u003ch3\u003eOrder with Confidence\u003c\/h3\u003e\u003cp\u003eFast shipping, responsive customer service, and authentic parts make Elkhart RV Parts your trusted source for RV tank fittings and plumbing components. Order your CPI Part # 55M flush FPT spinweld fitting today and experience the difference that quality parts make in your RV maintenance and repair projects.\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789642379323,"sku":"55M\/500153","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/cpi-1-1-4-flush-fpt-spinweld-fitting-membrane-55m-shopify-1.jpg?v=1779178918"},{"product_id":"rv-tank-fittings1-1-4-fitting-2-hole-size","title":"1-1\/4\" FPT Threaded Spinweld Fitting - Part # 55","description":"\u003cp\u003e1-1\/4\" FPT Threaded Spinweld Fitting for RV tanks (2\" Hole Size)\u003c\/p\u003e\n\u003cp\u003eCustom Plastics Part # 55 (500108)\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpin Weld Fitting for RV Fresh Water and Holding Tanks\u003c\/span\u003e\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789642575931,"sku":"55\/500108","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings1-1-4-fitting-2-hole-size-shopify-1.jpg?v=1779181210"},{"product_id":"cpi-1-5-fpt-spinweld-fitting-2-hole-size-part-56","title":"CPI - 1-1\/2\" FPT Spinweld Fitting - 2\" Hole Size - Part # 56","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #1d9bf0; font-weight: bold;\"\u003e✓ \u003cstrong\u003eElkhartRVParts.com - The Only Authorized Place for CPI Tank Fittings\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\n\n\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #10b981; font-weight: bold;\"\u003e✓ \u003cstrong\u003e100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eCPI 1-1\/2\" FPT Spinweld Fitting (Part #56)\u003c\/strong\u003e solves the most common RV tank connection challenge: achieving a secure, leak-free threaded connection that withstands road vibration and temperature changes. This precision-engineered fitting is designed specifically for RV fresh water and holding tank applications where reliability is non-negotiable.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1-1\/2\" Female Pipe Thread (FPT)\u003c\/strong\u003e - Standard NPT threading for universal compatibility with RV plumbing systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" Hole Size\u003c\/strong\u003e - Fits standard tank openings with secure spinweld installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Custom Plastics Construction\u003c\/strong\u003e - Engineered polymer resists corrosion, chemicals, and UV degradation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpinweld Design\u003c\/strong\u003e - Heat-fused installation creates permanent, leak-proof bond to tank wall\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Grade Quality\u003c\/strong\u003e - Meets or exceeds original equipment manufacturer specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-Application Use\u003c\/strong\u003e - Suitable for fresh water tanks, grey water tanks, and black water holding tanks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Resistant\u003c\/strong\u003e - Performs reliably in extreme RV operating conditions from -40°F to 150°F\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the CPI 1-1\/2\" FPT Spinweld Fitting?\u003c\/h2\u003e\n\u003cp\u003eWhen you're replacing or upgrading RV tank fittings, the \u003cstrong\u003eCPI 1-1\/2\" FPT spinweld fitting\u003c\/strong\u003e delivers the professional-grade performance mobile technicians and DIY RVers trust. Unlike cheaper alternatives that crack under pressure or loosen over time, this fitting's spinweld installation method creates a molecular bond with your tank that's stronger than the tank material itself. The precision-molded female pipe threads ensure proper seal with standard plumbing components, eliminating the frustration of cross-threading or stripped connections. Whether you're installing a new tank, repairing a damaged fitting, or upgrading your RV's plumbing system, this \u003cstrong\u003e1-1\/2\" threaded tank fitting\u003c\/strong\u003e provides the leak-free reliability you need for worry-free travels.\u003c\/p\u003e\n\n\u003ch2\u003eCompare CPI FPT Spinweld Fittings\u003c\/h2\u003e\n\u003cp\u003eChoosing the right FPT fitting depends on your tank's hole size and the connection size you need. Compare our complete range of CPI spinweld fittings to find the perfect match for your RV tank application:\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x: auto; margin: 20px 0;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e5e7eb;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #dc2626; color: white;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eThread Size\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eHole Size\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #fef2f2; border-left: 3px solid #dc2626;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\n\u003cstrong\u003ePart #56\u003c\/strong\u003e\u003cbr\u003e\u003csmall\u003eSKU: 56\/500109\u003c\/small\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1-1\/2\" FPT\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eStandard 1.5\" connections with 2\" tank openings\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCurrent Product\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\n\u003cstrong\u003ePart #57HD\u003c\/strong\u003e\u003cbr\u003e\u003csmall\u003eSKU: 57HD\/500501\u003c\/small\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1-1\/2\" FPT\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2-1\/2\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eHeavy-duty flush design for larger 2.5\" openings\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/cpi-1-5-inch-flush-fpt-hd-spinweld-fitting-57hd\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Part #57HD →\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\n\u003cstrong\u003ePart #65\u003c\/strong\u003e\u003cbr\u003e\u003csmall\u003eSKU: 65\u003c\/small\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2\" FPT\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2-1\/2\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eLarger 2\" connections for high-flow applications\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings2-fpt-fitting-2-1-2-hole-size\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Part #65 →\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\n\u003cstrong\u003ePart #83-LL\u003c\/strong\u003e\u003cbr\u003e\u003csmall\u003eSKU: 83-LL\u003c\/small\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1\/2\" FPT\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1-1\/8\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eCompact flush design for smaller connections\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings1-2-flush-fitting-1-1-8-hole-size\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Part #83-LL →\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"background-color: #f3f4f6; padding: 15px; border-left: 4px solid #dc2626; margin: 20px 0;\"\u003e\u003cstrong\u003e💡 Pro Tip:\u003c\/strong\u003e Measure your tank's existing hole diameter before ordering. If you're drilling a new hole, the 2\" hole size for Part #56 is ideal for standard 1-1\/2\" plumbing connections. For larger flow requirements or different hole sizes, consider the alternative models above.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 56\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 56\/500109\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e 1-1\/2\" Female Pipe Thread (FPT\/NPT)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank Hole Size Required:\u003c\/strong\u003e 2\" diameter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-grade custom plastics (engineered polymer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Method:\u003c\/strong\u003e Spinweld (heat fusion to tank wall)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Natural\/White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 2\" outer flange diameter, 1.5\" thread connection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to 150°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fresh water tanks, grey water tanks, black water holding tanks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e CPI (Custom Plastics Inc.)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOne (1) CPI 1-1\/2\" FPT Spinweld Fitting - Part #56\u003c\/li\u003e\n\u003cli\u003eManufacturer's quality guarantee\u003c\/li\u003e\n\u003cli\u003e30-day return policy from Elkhart RV Parts\u003c\/li\u003e\n\u003cli\u003eInstallation requires professional spinweld equipment (not included)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Models \u0026amp; Alternatives\u003c\/h2\u003e\n\u003cp\u003eThis fitting works with standard RV plumbing components including 1-1\/2\" MPT threaded pipes, valves, and adapters. For complete tank fitting solutions, explore our full range of \u003ca href=\"https:\/\/elkhartrvparts.com\/collections\/vendors?q=CPI\" style=\"color: #dc2626; font-weight: bold;\"\u003eCPI tank fittings and accessories\u003c\/a\u003e. If you need a different thread size or hole size, see the comparison table above for alternative CPI spinweld fittings.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eHow do I install a spinweld fitting on my RV tank?\u003c\/h3\u003e\n\u003cp\u003eSpinweld fittings require specialized heat-fusion equipment that melts the fitting base and tank material together, creating a permanent molecular bond. This installation method is typically performed by professional tank manufacturers or mobile RV technicians with spinweld tools. The process involves drilling a precise 2\" hole in your tank, positioning the fitting, and using a spinweld tool to fuse it in place. DIY installation is not recommended without proper equipment.\u003c\/p\u003e\n\n\u003ch3\u003eIs this fitting compatible with my RV's fresh water tank?\u003c\/h3\u003e\n\u003cp\u003eYes, the CPI 1-1\/2\" FPT spinweld fitting is designed for use with RV fresh water tanks, grey water tanks, and black water holding tanks. The food-grade custom plastics material is safe for potable water applications and resistant to the chemicals found in waste water systems. Verify that your tank has a 2\" hole opening and requires a 1-1\/2\" female threaded connection.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's the difference between FPT and MPT fittings?\u003c\/h3\u003e\n\u003cp\u003eFPT stands for Female Pipe Thread (internal threads), while MPT stands for Male Pipe Thread (external threads). This Part #56 fitting has female threads on the inside, so it accepts male threaded pipes, valves, or adapters. If you need to connect a female threaded component, you would need an MPT (male) fitting instead.\u003c\/p\u003e\n\n\u003ch3\u003eCan I use this fitting to replace a damaged tank fitting?\u003c\/h3\u003e\n\u003cp\u003eReplacing a spinweld fitting requires cutting out the old fitting and spinwelding a new one in place, which requires professional equipment and expertise. If your existing fitting is damaged, consult with a mobile RV technician or tank repair specialist who has spinweld capabilities. Attempting to remove and replace spinweld fittings without proper tools can damage your tank.\u003c\/p\u003e\n\n\u003ch3\u003eWhat size hole do I need to drill in my tank for this fitting?\u003c\/h3\u003e\n\u003cp\u003eThis fitting requires a 2\" diameter hole in your tank wall. Use a hole saw or step drill bit to create a clean, precise opening. Ensure the tank surface is clean, flat, and free of debris before spinweld installation. The fitting's flange will cover the hole perimeter and create a watertight seal when properly installed.\u003c\/p\u003e\n\n\u003ch3\u003eIs this fitting resistant to RV holding tank chemicals?\u003c\/h3\u003e\n\u003cp\u003eYes, the custom plastics material used in CPI fittings is engineered to resist common RV holding tank chemicals, deodorizers, and waste treatment products. The fitting will not degrade, crack, or corrode when exposed to typical RV sanitation chemicals, making it ideal for long-term use in black water and grey water tank applications.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Elkhart RV Parts?\u003c\/h2\u003e\n\u003cp\u003eElkhart RV Parts is your trusted source for authentic CPI tank fittings and RV plumbing components. We stock only genuine OEM grade parts directly from authorized manufacturers, ensuring you receive the same quality components used by RV manufacturers. Every product is backed by our 30-day return policy and ships quickly from our Indiana warehouse. Our team understands RV systems and can help you select the right fitting for your specific application.\u003c\/p\u003e\n\n\u003cdiv style=\"background-color: #fef2f2; border-left: 4px solid #dc2626; padding: 20px; margin: 30px 0;\"\u003e\n\u003cp style=\"margin: 0; font-size: 16px; font-weight: bold; color: #dc2626;\"\u003eReady to upgrade your RV tank connections? Order the CPI 1-1\/2\" FPT Spinweld Fitting today for fast shipping and authentic OEM quality. Questions? Our AI Live Chat is here to help you find the perfect fitting for your application.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789643001915,"sku":"56\/500109","price":5.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/cpi-1-5-fpt-spinweld-fitting-2-hole-size-part-56-shopify-1.jpg?v=1779179367"},{"product_id":"rv-tank-fittings2-fpt-fitting-2-1-2-hole-size","title":"2\" FPT Fitting 2 1\/2\" Hole Size Part # 65","description":"\u003cp\u003e2\" FPT Fitting (2 1\/2\" Hole Size)\u003c\/p\u003e\n\u003cp\u003ePart # 65 (500113)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789643493435,"sku":"65","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings2-fpt-fitting-2-1-2-hole-size-shopify-1.jpg?v=1779181555"},{"product_id":"rv-tank-fittings1-4-flush-fitting-1-2-hole-size","title":"1\/4\" Flush Spinweld Fitting 1\/2\" Hole Size Part # 84I","description":"\u003cp\u003e1\/4\" Flush Spinweld Fitting (1\/2\" Hole Size) \u003c\/p\u003e\n\u003cp\u003ePart # 84I (500154)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789643690043,"sku":"84I","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings1-4-flush-fitting-1-2-hole-size-shopify-1.jpg?v=1779181261"},{"product_id":"rv-tank-fittings1-fpt-fitting-1-1-2-hole-size","title":"1\" FPT Raised Threaded Spinweld Fitting - Part # 77\/77-LL","description":"\u003cp\u003e1\" FPT Raised Threaded Spinweld Fitting (1 1\/2\" Hole Size)\u003c\/p\u003e\n\u003cp\u003eCustom Plastics Part # 77-LL (500107)\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpin Weld Fitting for RV Fresh Water and Holding Tanks\u003c\/span\u003e\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789644181563,"sku":"77\/77-LL\/500107","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings1-fpt-fitting-1-1-2-hole-size-shopify-1.jpg?v=1779181402"},{"product_id":"rv-tank-fittings2-patch-1-5-8-hole-size","title":"2\" White Patch 1 5\/8\" Hole Size Part # 51\/51-LL","description":"\u003cp\u003e2\" White Patch (1 5\/8\" Hole Size) \u003c\/p\u003e\n\u003cp\u003ePart # 51-LL \/500237 with UV Protection\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789644542011,"sku":"51","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings2-patch-1-5-8-hole-size-shopify-1.jpg?v=1779181508"},{"product_id":"rv-tank-fittings1-patch-7-8-hole-size","title":"1\" Spinweld Patch - Part # 51AD","description":"\u003cp\u003e1\" Spinweld Patch (7\/8\" Hole Size)\u003c\/p\u003e\n\u003cp\u003eCustom Plastics Part # 51AD (500119) \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpin Weld Patch for RV Fresh Water and Holding Tanks\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePatch to repair\/cover holes in tank\u003c\/span\u003e\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789644673083,"sku":"51AD\/500119","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings1-patch-7-8-hole-size-shopify-1.jpg?v=1779181421"},{"product_id":"cpi-1-5-inch-flush-fpt-hd-spinweld-fitting-57hd","title":"CPI - 1-1\/2\" Flush FPT HD Spinweld Fitting - 2-1\/2\" Hole Size - Part # 57HD","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #1d9bf0; font-weight: bold;\"\u003e✓ \u003cstrong\u003eElkhartRVParts.com - The Only Authorized Place for CPI Components\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #10b981; font-weight: bold;\"\u003e✓ \u003cstrong\u003e100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\u003ch2\u003eCPI 1-1\/2\" Flush FPT HD Spinweld Fitting - Heavy-Duty RV Tank Component\u003c\/h2\u003e\u003cp\u003eThe CPI 1-1\/2\" Flush FPT HD Spinweld Fitting (Part # 57HD) is a premium heavy-duty tank fitting designed specifically for RV fresh water and holding tank installations. This authentic Custom Plastics (CPI) component features robust construction that exceeds standard fitting specifications, making it the ideal choice for demanding RV applications where reliability and durability are essential.\u003c\/p\u003e\u003ch2\u003eWhy Choose This Heavy-Duty Spinweld Fitting\u003c\/h2\u003e\u003cp\u003eWhen you're installing or repairing RV tank fittings, choosing heavy-duty components ensures long-lasting performance and peace of mind on the road. This HD (Heavy-Duty) spinweld fitting from CPI is engineered with reinforced construction that withstands the vibration, temperature fluctuations, and stress of RV travel better than standard fittings. The flush-mount design provides a low-profile installation that maximizes interior tank space while the 1-1\/2\" female pipe thread connection ensures compatibility with standard RV plumbing components.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 57HD (CPI Part # 500501)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Size:\u003c\/strong\u003e 1-1\/2 inch Female Pipe Thread (FPT)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Size Required:\u003c\/strong\u003e 2-1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Type:\u003c\/strong\u003e Flush mount spinweld\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Heavy-Duty (HD) reinforced design\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-grade plastic polymer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Custom Plastics Inc. (CPI)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 12 oz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Brand New OEM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 57HD\/500501\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e RV fresh water tanks, RV holding tanks\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatible RV Tank Applications\u003c\/h2\u003e\u003cp\u003eThis versatile 1-1\/2\" flush FPT fitting is designed for use in both fresh water and holding tank systems. The heavy-duty construction makes it particularly well-suited for high-use applications such as main tank drains, fill connections, and vent fittings where standard components may fail over time.\u003c\/p\u003e\u003cp\u003eIf you're building or repairing a complete RV tank system, consider these complementary CPI spinweld fittings:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings1-1-2-fpt-fitting-2-hole-size\"\u003e1-1\/2\" FPT Spinweld Fitting (Part # 56)\u003c\/a\u003e - Standard duty version for lighter applications\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings1-1-2-flush-with-membrane-2-1-4-hole-size\"\u003e1-1\/2\" Flush Spinweld Fitting w\/ Membrane (Part # 57M)\u003c\/a\u003e - Includes membrane for odor control\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/2-fpt-flush-spinweld-fitting-part-58\"\u003e2\" FPT Flush Spinweld Fitting (Part # 58)\u003c\/a\u003e - Larger size for high-flow applications\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings1-1-4-fitting-2-hole-size\"\u003e1-1\/4\" FPT Threaded Spinweld Fitting (Part # 55)\u003c\/a\u003e - Smaller size for vent lines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation and Use Cases\u003c\/h2\u003e\u003cp\u003eThe spinweld installation method creates a permanent, leak-proof bond between the fitting and your RV tank. This flush-mount design sits nearly flat against the tank surface, making it ideal for installations where interior clearance is limited or where a low-profile fitting is preferred for aesthetic reasons.\u003c\/p\u003e\u003ch3\u003eCommon Applications:\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFresh water tank drain connections\u003c\/li\u003e\n\u003cli\u003eHolding tank drain fittings (black and gray water)\u003c\/li\u003e\n\u003cli\u003eTank fill port installations\u003c\/li\u003e\n\u003cli\u003eVent line connections\u003c\/li\u003e\n\u003cli\u003eTank sensor wire pass-throughs\u003c\/li\u003e\n\u003cli\u003eRV tank repairs and renovations\u003c\/li\u003e\n\u003cli\u003eCustom RV tank fabrication projects\u003c\/li\u003e\n\u003cli\u003eReplacement for worn or damaged fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompare 1-1\/2\" Spinweld Fittings\u003c\/h2\u003e\u003cdiv style=\"overflow-x: auto; margin: 20px 0;\"\u003e\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e5e7eb;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background-color: #dc2626; color: white;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003ePart Number\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eConstruction\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: white;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1-1\/2\" FPT Spinweld\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e56\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eStandard duty\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eLight-duty applications, budget builds\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings1-1-2-fpt-fitting-2-hole-size\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fef2f2; border-left: 3px solid #dc2626;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003e1-1\/2\" Flush FPT HD\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003e57HD\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eHeavy-Duty (HD)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eHigh-stress applications, main drains\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCurrent Product\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: white;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1-1\/2\" Flush w\/ Membrane\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e57M\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eStandard + membrane\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eHolding tanks needing odor control\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings1-1-2-flush-with-membrane-2-1-4-hole-size\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 15px; margin-top: 15px;\"\u003e\u003cstrong\u003eHelpful Tip:\u003c\/strong\u003e Choose the HD (Heavy-Duty) version for main tank drains, high-flow applications, or anywhere you need extra strength and durability. The standard version (Part # 56) works well for secondary connections and vent lines, while the membrane version (Part # 57M) is ideal for holding tank applications where odor control is important.\u003c\/p\u003e\u003ch2\u003eAuthentic CPI Quality You Can Trust\u003c\/h2\u003e\u003cp\u003eCustom Plastics Inc. (CPI) has been manufacturing premium RV tank components for decades, earning a reputation for quality and reliability in the RV industry. This 1-1\/2\" Flush FPT HD Spinweld Fitting represents the same level of craftsmanship and engineering that RV manufacturers trust for factory installations.\u003c\/p\u003e\u003ch3\u003eWhat Sets This HD Fitting Apart:\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eReinforced heavy-duty construction for extended service life\u003c\/li\u003e\n\u003cli\u003ePrecision-molded threads for leak-free connections\u003c\/li\u003e\n\u003cli\u003eUV-resistant material that won't degrade in sunlight\u003c\/li\u003e\n\u003cli\u003eChemical-resistant polymer suitable for all tank types\u003c\/li\u003e\n\u003cli\u003eFlush-mount design maximizes usable tank capacity\u003c\/li\u003e\n\u003cli\u003e2-1\/2\" hole size standard for easy installation\u003c\/li\u003e\n\u003cli\u003eCompatible with all standard 1-1\/2\" NPT plumbing components\u003c\/li\u003e\n\u003cli\u003eTested to withstand RV travel vibration and stress\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eWhat is the difference between the HD and standard 1-1\/2\" fittings?\u003c\/h3\u003e\u003cp\u003eThe HD (Heavy-Duty) version features reinforced construction with thicker walls and enhanced structural integrity compared to the standard Part # 56. This makes it ideal for high-stress applications like main tank drains where durability is critical.\u003c\/p\u003e\u003ch3\u003eWhat size hole do I need to drill for this fitting?\u003c\/h3\u003e\u003cp\u003eThis fitting requires a 2-1\/2 inch diameter hole for proper installation. The spinweld process creates a permanent bond between the fitting and the tank material.\u003c\/p\u003e\u003ch3\u003eCan this fitting be used on both fresh water and holding tanks?\u003c\/h3\u003e\u003cp\u003eYes, this CPI fitting is designed for use on both fresh water tanks and holding tanks (black and gray water). The chemical-resistant material is suitable for all RV tank applications.\u003c\/p\u003e\u003ch3\u003eIs this a flush mount or raised fitting?\u003c\/h3\u003e\u003cp\u003eThis is a flush-mount fitting, meaning it sits nearly flat against the tank surface with minimal protrusion into the tank interior. This design maximizes usable tank capacity.\u003c\/p\u003e\u003ch3\u003eWhat does FPT mean?\u003c\/h3\u003e\u003cp\u003eFPT stands for Female Pipe Thread. This fitting has internal (female) threads that accept standard 1-1\/2\" male NPT pipe fittings, valves, or adapters.\u003c\/p\u003e\u003ch3\u003eHow do I install a spinweld fitting?\u003c\/h3\u003e\u003cp\u003eSpinweld fittings require a specialized spin welding tool that rotates the fitting at high speed to generate friction heat, melting the plastic and creating a permanent bond with the tank. This is typically done during tank manufacturing or by professional tank fabricators.\u003c\/p\u003e\u003ch2\u003eCustomer Reviews Highlight Quality and Performance\u003c\/h2\u003e\u003cp\u003eWith an impressive 5.0-star rating from 8 verified customer reviews, this CPI fitting has earned high marks for quality, fitment, and value. Customers consistently praise the heavy-duty construction, perfect fit, and fast shipping. Many reviewers mention successful use in RV renovation projects and tank repair applications.\u003c\/p\u003e\u003ch2\u003eOrder Your Authentic CPI Fitting Today\u003c\/h2\u003e\u003cp\u003eWhether you're building a custom RV tank system, repairing existing tanks, or upgrading to heavy-duty components, this CPI 1-1\/2\" Flush FPT HD Spinweld Fitting delivers the quality and reliability you need. Fast shipping, authentic OEM quality, and expert support make Elkhart RV Parts your trusted source for RV tank fittings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNeed help selecting the right fitting for your project?\u003c\/strong\u003e Use our AI Live Chat for deep product knowledge and expert assistance with compatibility questions.\u003c\/p\u003e\u003cp style=\"background-color: #f3f4f6; border-left: 4px solid #dc2626; padding: 15px; margin-top: 20px;\"\u003e\u003cstrong\u003eReady to upgrade to heavy-duty quality?\u003c\/strong\u003e Add this authentic CPI 1-1\/2\" Flush FPT HD Spinweld Fitting to your cart now and experience the difference that professional-grade components make.\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789644771387,"sku":"57HD\/500501","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/cpi-1-5-inch-flush-fpt-hd-spinweld-fitting-57hd-shopify-1.jpg?v=1779179475"},{"product_id":"rv-tank-fittings1-1-2-flush-with-membrane-2-1-4-hole-size","title":"1-1\/2\" Flush Spinweld Fitting w\/ Membrane - Part # 57M","description":"\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e1-1\/2\" FPT Flush Spinweld Fitting with Membrane\u003c\/span\u003e (2 1\/4\" Hole Size) \u003c\/p\u003e\n\u003cp\u003eCustom Plastics Part # 57M (500496)  \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpin Weld Fitting for RV Fresh Water and Holding Tanks\u003c\/span\u003e\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789645393979,"sku":"57M\/500496","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings1-1-2-flush-with-membrane-2-1-4-hole-size-shopify-1.jpg?v=1779181284"},{"product_id":"rv-tank-fittings1-1-2-flex-fitting-2-1-4-hole-size","title":"3\" Round Polypropylene Plug - Red","description":"\u003ch3\u003e\n\u003cstrong\u003e3\" Round Polypropylene Plug - Red\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e  \u003c\/strong\u003e\u003c\/p\u003e","brand":"Cleartek Packaging","offers":[{"title":"Default Title","offer_id":32789646049339,"sku":"RedPlug3.00","price":1.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/products\/cap_poly-red.jpg?v=1668545440"},{"product_id":"rv-tank-fittings2-flex-fitting-2-3-4-hole-size","title":"2\" Flex Fitting 2 3\/4\" Hole Size Part # 92","description":"\u003cp\u003e2\" Flex Grommet Fitting (2 3\/4\" Hole Size)\u003c\/p\u003e\n\u003cp\u003ePart # 92 (500124)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789646311483,"sku":"92","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings2-flex-fitting-2-3-4-hole-size-shopify-1.jpg?v=1779181527"},{"product_id":"cpi-3-flex-black-rubber-tank-fitting-3-7-8-hole-size-part-93-500125","title":"CPI - 3\" Flex Black Rubber Tank Fitting - 3 7\/8\" Hole Size - Part # 93 (500125)","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #1d9bf0; font-weight: bold;\"\u003e\u003cstrong\u003e✓ ElkhartRVParts.com - The Only Authorized Place for CPI Tank Fittings\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #10b981; font-weight: bold;\"\u003e\u003cstrong\u003e✓ 100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\u003ch2\u003eCPI 3\" Flex Black Rubber Tank Fitting - Professional Grade RV Plumbing Solution\u003c\/h2\u003e\u003cp\u003eThe CPI 3\" Flex Black Rubber Tank Fitting (Part # 93 \/ 500125) is a professional-grade grommet designed specifically for plumbing connections into RV black water and grey water holding tanks. This flexible rubber fitting accommodates a 3 7\/8\" hole size and provides a secure, leak-resistant seal for 3-inch plumbing applications.\u003c\/p\u003e\u003ch2\u003eWhy Choose This CPI Flex Tank Fitting\u003c\/h2\u003e\u003cp\u003eCPI has been manufacturing premium RV tank fittings for decades, and this 3\" flex fitting represents their commitment to quality and reliability. The flexible black rubber construction allows for easier installation while maintaining a watertight seal, even when dealing with slight misalignments or tank wall irregularities. This fitting is engineered to withstand the harsh conditions of RV waste systems, including temperature fluctuations, chemical exposure, and constant vibration during travel.\u003c\/p\u003e\u003ch2\u003eKey Features and Benefits\u003c\/h2\u003e\u003cp\u003eThis 3\" flex fitting features durable black rubber construction that resists cracking and degradation from waste tank chemicals. The flexible design accommodates minor installation variations and provides stress relief that rigid fittings cannot match. With a 3 7\/8\" hole size requirement, this fitting installs quickly using standard hole saws, and the rubber material creates a compression seal that prevents leaks without requiring extensive sealant application.\u003c\/p\u003e\u003cp\u003eThe fitting's 3-inch diameter is ideal for main tank outlets, drain connections, and larger vent applications. The black rubber material is UV-resistant and maintains its flexibility across a wide temperature range, ensuring reliable performance whether you're camping in Arizona summers or Minnesota winters.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 93 (500125)\u003cbr\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e CPI\u003cbr\u003e\u003cstrong\u003eFitting Diameter:\u003c\/strong\u003e 3 inches\u003cbr\u003e\u003cstrong\u003eRequired Hole Size:\u003c\/strong\u003e 3 7\/8 inches (3.875\")\u003cbr\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e Black Rubber\u003cbr\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e RV Black \u0026amp; Grey Water Holding Tanks\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.7 lbs\u003cbr\u003e\u003cstrong\u003eBarcode:\u003c\/strong\u003e 46409787\u003c\/p\u003e\u003ch2\u003eInstallation and Compatibility\u003c\/h2\u003e\u003cp\u003eThis flex fitting is designed for use with standard 3-inch PVC or ABS plumbing pipes commonly found in RV waste systems. Installation requires drilling a 3 7\/8\" hole in the tank wall, inserting the fitting, and securing it according to manufacturer specifications. The flexible rubber design allows for some angular adjustment during installation, making it easier to align with existing plumbing runs.\u003c\/p\u003e\u003cp\u003eThis fitting is compatible with most RV holding tank materials including polyethylene, polypropylene, and ABS plastic tanks. It works with both black water and grey water applications and can be used for tank outlets, drain connections, or large-diameter vent installations.\u003c\/p\u003e\u003ch2\u003eComplete Your Tank Fitting Setup\u003c\/h2\u003e\u003cp\u003eFor comprehensive tank plumbing solutions, consider these compatible CPI fittings: The \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/cpi-rv-tank-grommet-fitting-1-5-inch-2-25-hole-part-91\" style=\"color: #dc2626; font-weight: bold;\"\u003eCPI 1-1\/2\" Tank Grommet Fitting (Part 91)\u003c\/a\u003e is perfect for smaller inlet or vent connections. For 2-inch applications, the \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings2-flex-fitting-2-3-4-hole-size\" style=\"color: #dc2626; font-weight: bold;\"\u003e2\" Flex Fitting (Part 92)\u003c\/a\u003e offers the same flexible design in a smaller size. Don't forget \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/adcoseal-b-100-butyl-rubber-sealent\" style=\"color: #dc2626; font-weight: bold;\"\u003especialized RV tank sealant\u003c\/a\u003e to ensure a completely leak-proof installation.\u003c\/p\u003e\u003ch2\u003eCompare 3\" Tank Fitting Options\u003c\/h2\u003e\u003cdiv style=\"overflow-x: auto; margin: 20px 0;\"\u003e\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e5e7eb;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background-color: #dc2626; color: white;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eType\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eHole Size\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003ePart Number\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #fef2f2; border-left: 4px solid #dc2626;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: bold;\"\u003eCPI Part 93\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFlex Rubber Fitting\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e3 7\/8\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e93 (500125)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFlexible installation, main outlets\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCurrent Product\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: bold;\"\u003eUniseal U300\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eGrommet Seal\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e4\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eU300\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eWatertight seal, Schedule 40 PVC\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/3-uniseal-grommet-black-u300\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: bold;\"\u003eCPI Part 92\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFlex Rubber Fitting\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2 3\/4\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e92\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2\" applications, smaller outlets\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-tank-fittings2-flex-fitting-2-3-4-hole-size\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp style=\"background-color: #f3f4f6; border-left: 4px solid #dc2626; padding: 15px; margin-top: 15px;\"\u003e\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Choose flex rubber fittings like the CPI Part 93 when you need installation flexibility and stress relief. Uniseal grommets work best when you need a permanent watertight seal with Schedule 40 PVC pipe.\u003c\/p\u003e\u003ch2\u003eWhy Buy From Elkhart RV Parts\u003c\/h2\u003e\u003cp\u003eWhen you purchase this CPI 3\" flex fitting from Elkhart RV Parts, you're getting an authentic OEM-grade component backed by our commitment to quality. We stock genuine CPI parts and ship them quickly so you can complete your RV repairs without delay. Our team understands RV plumbing systems and can help ensure you're ordering the correct fitting for your specific application.\u003c\/p\u003e\u003cp\u003eWith an average customer rating of 4.6 out of 5 stars based on 9 reviews, this fitting has proven its reliability in real-world RV applications. Customers appreciate the quality construction, ease of installation, and long-lasting performance.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eWhat size hole do I need for this 3\" flex fitting?\u003c\/h3\u003e\u003cp\u003eThis fitting requires a 3 7\/8\" (3.875 inch) hole. Use a 3 7\/8\" hole saw for accurate installation.\u003c\/p\u003e\u003ch3\u003eCan this fitting be used for both black and grey water tanks?\u003c\/h3\u003e\u003cp\u003eYes, this CPI flex fitting is suitable for both black water and grey water holding tank applications.\u003c\/p\u003e\u003ch3\u003eDo I need sealant with this rubber fitting?\u003c\/h3\u003e\u003cp\u003eWhile the rubber creates a compression seal, we recommend using specialized RV tank sealant for maximum leak protection, especially on older tanks or in high-stress applications.\u003c\/p\u003e\u003ch3\u003eWill this work with 3\" PVC pipe?\u003c\/h3\u003e\u003cp\u003eYes, this fitting is designed to work with standard 3-inch PVC or ABS plumbing pipes commonly used in RV waste systems.\u003c\/p\u003e\u003ch2\u003eOrder Your CPI 3\" Flex Tank Fitting Today\u003c\/h2\u003e\u003cp\u003eDon't let a faulty tank fitting compromise your RV's waste system. Order this genuine CPI 3\" flex black rubber tank fitting today and enjoy fast shipping, authentic OEM quality, and the peace of mind that comes with proper RV plumbing components. For questions about compatibility or installation, use our AI Live Chat for expert product guidance.\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789646409787,"sku":"93","price":5.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/cpi-3-flex-black-rubber-tank-fitting-3-7-8-hole-size-part-93-500125-shopify-1.jpg?v=1779179884"},{"product_id":"rv-tank-fittingsbreather-patch-1-1-8-hole-size","title":"Breather Patch 1 1\/8\" Hole Size Part # 51A BA","description":"\u003cp\u003eBreather Patch (1 1\/8\" Hole Size)\u003c\/p\u003e\n\u003cp\u003ePart # 51A (BA) 500504\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789646704699,"sku":"51A","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittingsbreather-patch-1-1-8-hole-size-shopify-1.jpg?v=1779181586"},{"product_id":"rv-tank-fittingsblack-probe-patch-1-2-hole-size","title":"1\/2\" Black Probe Patch 1\/2\" Hole Size Part # 50B","description":"\u003cp\u003eBlack Probe Patch (1\/2\" Hole Size)\u003c\/p\u003e\n\u003cp\u003ePart # 50B (500117)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789647196219,"sku":"50B","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittingsblack-probe-patch-1-2-hole-size-shopify-1.jpg?v=1779181545"},{"product_id":"rv-tank-fittings1-2-filter-screens","title":"1x of 1\/2\" Filter Screens for Horst Miracle Probe used Black Water Tanks Part # 311","description":"\u003cp\u003e1\/2\" Filter Screens for Horst Miracle Probe\u003c\/p\u003e\n\u003cp\u003eUse on Black Water Tanks \u003c\/p\u003e\n\u003cp\u003ePart # 311 (501104)\u003c\/p\u003e\n\u003cp\u003eSold by each\u003c\/p\u003e","brand":"Elkhart RV Parts","offers":[{"title":"Default Title","offer_id":32789647917115,"sku":"311","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/products\/501104-1__59327.png?v=1584468133"},{"product_id":"rv-tank-fittings2-1-8-clamp","title":"2 1\/8\" Clamp 600130","description":"\u003cp\u003e2 1\/8\" Adjustable Clamp \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789649096763,"sku":"600130","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings2-1-8-clamp-shopify-1.jpg?v=1779181347"},{"product_id":"rv-tank-fittings2-black-spin-patch-1-hole-size","title":"2\" Black Spin Patch 1\" Hole Size Part # 51AB","description":"\u003cp\u003e2\" Black Spin Patch (1\" Hole Size)\u003c\/p\u003e\n\u003cp\u003ePart # 51AB (500179)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789649719355,"sku":"51AB","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rv-tank-fittings2-black-spin-patch-1-hole-size-shopify-1.jpg?v=1779181436"},{"product_id":"3-black-patch-1-3-4-hole-size-part-81","title":"3\" Black Patch 1-3\/4\" Hole Size Part # 81","description":"\u003cp\u003e3\" Black Patch (1-3\/4\" Hole Size)\u003c\/p\u003e\n\u003cp\u003ePart # 81 (500057)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41646472921240,"sku":"81","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-black-patch-1-3-4-hole-size-part-81-shopify-1.jpg?v=1779178497"},{"product_id":"3-raised-fitting-3-3-4-hole-size-part-59","title":"3\" Raised Fitting 3-3\/4\" Hole Size Part # 59","description":"\u003cp\u003e3\" Raised Fitting (3-3\/4\" Hole Size) \u003c\/p\u003e\n\u003cp\u003ePart # 59 (500114)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41646539800728,"sku":"59","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-raised-fitting-3-3-4-hole-size-part-59-shopify-1.jpg?v=1779178579"},{"product_id":"3-flush-spinweld-fitting-3-7-8-hole-size-part-60","title":"3\" Flush Spinweld Fitting 3-7\/8\" Hole Size Part # 60","description":"\u003cp\u003e3\" Flush Spinweld Fitting (3-7\/8\" Hole Size)\u003c\/p\u003e\n\u003cp\u003ePart # 60 (500115) \u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41646563885208,"sku":"60","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-flush-spinweld-fitting-3-7-8-hole-size-part-60-shopify-1.jpg?v=1779178611"},{"product_id":"3-flush-fitting-3-7-8-hole-size-part-60m","title":"3\" Flush Fitting 3-7\/8\" Hole Size Part # 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76","description":"\u003cp\u003e3\" Patch (1 5\/8\" Hole Size)\u003c\/p\u003e\n\u003cp\u003ePart #76 (500118)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41646621524120,"sku":"500118","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-patch-2-1-2-hole-size-part-76-shopify-1.jpg?v=1779178573"},{"product_id":"3-4-threaded-drain-fitting-1-3-8-hole-size-part-74-500106","title":"3\/4\" FPT Raised Drain Fitting 1-3\/8\" Hole Size Part  #74","description":"\u003cp\u003e3\/4\" FPT Raised Drain Fitting (1-3\/8\" Hole Size) \u003c\/p\u003e\n\u003cp\u003ePart  #74 (500106)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41646650884248,"sku":"74_500106","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-4-threaded-drain-fitting-1-3-8-hole-size-part-74-500106-shopify-1.jpg?v=1779178274"},{"product_id":"3-4-flush-fitting-1-3-8-hole-size-part-79","title":"3\/4\" FPT Flush Spinweld Fitting 1-3\/8\" Hole Size\" Part # 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79 LL\u003c\/span\u003e\u003c\/div\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41646678081688,"sku":"79","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-4-flush-fitting-1-3-8-hole-size-part-79-shopify-1.jpg?v=1779177975"},{"product_id":"3-flush-hd-fitting-4-hole-size-part-60-hd","title":"3\" Flush HD Fitting 4\" Hole Size Part # 60HD","description":"\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationStrong_rpyvj\" data-mce-fragment=\"1\"\u003e3\" Flush HD Fitting (4\" Hole Size)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003ePart # 60HD SKU: 500349\u003c\/span\u003e\u003c\/div\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41646769537176,"sku":"60HD","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-flush-hd-fitting-4-hole-size-part-60-hd-shopify-1.jpg?v=1779178513"},{"product_id":"3-raised-hd-fitting-4-hole-size-part-59hd","title":"3\" Raised HD Fitting 4\" Hole Size Part # 59HD","description":"\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" class=\"Polaris-TextStyle--variationStrong_rpyvj\"\u003e3\" Raised Threaded HD Fitting (4\" Hole Size)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" class=\"Polaris-TextStyle--variationStrong_rpyvj\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" class=\"Polaris-TextStyle--variationStrong_rpyvj\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003ePart # 59HD SKU: 500495 \u003c\/span\u003e\u003c\/div\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41646774616216,"sku":"59HD","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-raised-hd-fitting-4-hole-size-part-59hd-shopify-1_c45c62ba-6821-437f-90f7-159b0b8555fe.jpg?v=1779178706"},{"product_id":"horst-miracle-probe-black-water-tank-sensor-500674","title":"Elkhart Plastics - Horst Miracle Probe for RV Black Water Tanks - 500674 - 2.4375\" Length - Single Probe","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 16px; margin-bottom: 20px;\"\u003e\n\u003cp style=\"margin: 0; color: #1d9bf0; font-weight: bold;\"\u003e✓ \u003cstrong\u003eElkhartRVParts.com - The Only Authorized Place for Elkhart Plastics\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 16px; margin-bottom: 20px;\"\u003e\n\u003cp style=\"margin: 0; color: #10b981; font-weight: bold;\"\u003e✓ \u003cstrong\u003e100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eIf you're tired of inaccurate black water tank readings caused by waste buildup and toilet paper residue, the \u003cstrong\u003eHorst Miracle Probe 500674\u003c\/strong\u003e is your solution. This precision-engineered RV black tank sensor eliminates false readings and delivers reliable monitoring every time, giving you confidence in your holding tank levels on every trip.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielded Brass Tips:\u003c\/strong\u003e Prevents waste buildup interference for accurate readings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTeflon Insulators:\u003c\/strong\u003e Long-lasting durability and electrical isolation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Fit:\u003c\/strong\u003e Designed for standard 3\/8\" screw-in sensor holes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack Water Optimized:\u003c\/strong\u003e Specifically engineered for RV waste holding tanks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.4375\" Probe Length:\u003c\/strong\u003e Ideal depth for most RV black tank applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM-Grade Quality:\u003c\/strong\u003e Made by Horst Engineering (Elkhart Plastics) - trusted RV sanitation experts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy DIY Installation:\u003c\/strong\u003e No tank removal or special tools required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the Horst Miracle Probe for Black Water Tanks?\u003c\/h2\u003e\n\u003cp\u003eStandard factory tank sensors fail because they're exposed to waste, toilet paper, and residue that creates false electrical contact. The \u003cstrong\u003eHorst Miracle Probe\u003c\/strong\u003e solves this with a revolutionary shielded design that keeps the brass sensing tip clean and accurate. You'll get real-time, precise black tank level monitoring without the guesswork. Whether you're a weekend warrior or full-time RVer, this black water tank sensor ensures you never overfill or misjudge your holding tank capacity again.\u003c\/p\u003e\n\n\u003ch2\u003eCompare RV Tank Sensors \u0026amp; Monitoring Solutions\u003c\/h2\u003e\n\u003cp\u003eNot sure which tank sensor or monitoring system is right for your RV? Compare the Horst Miracle Probe with other popular options to find the best fit for your black, gray, or fresh water tanks.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x: auto; margin: 20px 0;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e5e7eb;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #dc2626; color: white;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eTank Type\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eQuantity\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eProbe Length\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #fef2f2; border-left: 3px solid #dc2626;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eHorst Miracle Probe 500674\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eBlack Water\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1 Probe\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e2.4375\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eIndividual black tank sensor replacement\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCurrent Product\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eMini Probes 500674M\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFresh \u0026amp; Gray Water\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e6 Pack\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eBulk replacement for fresh\/gray tanks\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/elkhart-mini-probes-rv-water-tanks-500674m-pack-6\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eKIB Wall Panel Monitor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eAll Tanks\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eMonitor Only\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eN\/A\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eComplete monitoring system for up to 3 tanks\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/kib-tank-level-sensor-wall-panel-monitor-for-up-to-3-rv-holding-tanks\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eUniversal Holding Tank Kit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eBlack \u0026amp; Gray Water\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e4 Sensors + Fittings\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eVaries\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eComplete DIY installation kit with couplers\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-holding-tank-fittings-kit-sensors-black-grey-water\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 16px; margin-top: 20px;\"\u003e\u003cstrong\u003e💡 Pro Tip:\u003c\/strong\u003e Most RV black tanks use 3-4 sensor probes to indicate empty, 1\/3, 2\/3, and full levels. Check how many sensor ports your tank has before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 500674\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 5019\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Horst Engineering (Elkhart Plastics)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProbe Length:\u003c\/strong\u003e 2.4375\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Diameter:\u003c\/strong\u003e 0.375\" (3\/8\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass tips with Teflon insulators\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank Compatibility:\u003c\/strong\u003e RV black water holding tanks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Resistance-based (OEM-style)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Screw-in replacement for existing sensor holes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.5 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Canada (Quebec)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x Horst Miracle Probe for Black Water Tanks (500674)\u003c\/li\u003e\n\u003cli\u003eManufacturer's quality guarantee\u003c\/li\u003e\n\u003cli\u003eCompatible with standard OEM resistance-based tank monitoring systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Models \u0026amp; Alternatives\u003c\/h2\u003e\n\u003cp\u003eThe Horst Miracle Probe 500674 is designed for RV black water tanks with standard 3\/8\" sensor ports. If you need sensors for fresh or gray water tanks, check out the \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/elkhart-mini-probes-rv-water-tanks-500674m-pack-6\" style=\"color: #dc2626; font-weight: bold;\"\u003eElkhart Mini Probes 500674M 6-Pack\u003c\/a\u003e. For a complete holding tank upgrade, explore our \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/rv-holding-tank-fittings-kit-sensors-black-grey-water\" style=\"color: #dc2626; font-weight: bold;\"\u003eUniversal Holding Tank Fittings Kit\u003c\/a\u003e with sensors and couplers.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eHow do I install the Horst Miracle Probe in my RV black tank?\u003c\/h3\u003e\n\u003cp\u003eInstallation is simple: locate the existing sensor on your black water tank, unscrew the old probe, and screw in the Horst Miracle Probe 500674. No tank removal, no special tools, and no plumbing modifications required. The 3\/8\" threaded design fits standard RV tank sensor ports.\u003c\/p\u003e\n\n\u003ch3\u003eIs this probe compatible with SeeLevel or ultrasonic tank monitors?\u003c\/h3\u003e\n\u003cp\u003eNo, the Horst Miracle Probe 500674 is designed for standard OEM-style resistance-based tank monitoring systems. It is not compatible with ultrasonic sensors like SeeLevel or external monitoring systems.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's the difference between black water probes and fresh\/gray water probes?\u003c\/h3\u003e\n\u003cp\u003eBlack water probes like the Horst Miracle Probe 500674 feature shielded brass tips specifically designed to resist waste buildup and toilet paper interference. Fresh and gray water probes (like the 500674M Mini Probes) are shorter and optimized for cleaner water applications.\u003c\/p\u003e\n\n\u003ch3\u003eHow many Horst Miracle Probes do I need for one black tank?\u003c\/h3\u003e\n\u003cp\u003eMost RV black tanks use 3-4 sensor probes to indicate empty, 1\/3 full, 2\/3 full, and full levels. Check your tank's sensor port configuration to determine how many probes you need.\u003c\/p\u003e\n\n\u003ch3\u003eCan I use this probe in my gray water or fresh water tank?\u003c\/h3\u003e\n\u003cp\u003eWhile the Horst Miracle Probe 500674 will physically fit, it's specifically engineered for black water tanks. For fresh and gray water applications, we recommend the \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/elkhart-mini-probes-rv-water-tanks-500674m-pack-6\" style=\"color: #dc2626; font-weight: bold;\"\u003eElkhart Mini Probes 500674M\u003c\/a\u003e which are optimized for those tank types.\u003c\/p\u003e\n\n\u003ch3\u003eWhy are my RV tank sensors giving false readings?\u003c\/h3\u003e\n\u003cp\u003eFalse readings are typically caused by waste buildup, toilet paper, or residue creating electrical contact on exposed sensor tips. The Horst Miracle Probe's shielded design prevents this interference, ensuring accurate black tank level monitoring.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Elkhart RV Parts?\u003c\/h2\u003e\n\u003cp\u003eElkhart RV Parts is the authorized distributor for Elkhart Plastics and Horst Engineering products. Every Horst Miracle Probe we sell is 100% authentic, OEM-grade quality backed by manufacturer warranties. We specialize in RV holding tank components, plumbing fittings, and sanitation systems with expert support and fast shipping. Our commitment to quality means you get the right part, the first time, with confidence.\u003c\/p\u003e\n\n\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #dc2626; padding: 16px; margin-top: 30px;\"\u003e\n\u003cp style=\"margin: 0; font-weight: bold; color: #dc2626;\"\u003e🚀 Ready to eliminate false black tank readings? Add the Horst Miracle Probe 500674 to your cart now! Questions? Our AI Live Chat is here to help you find the perfect tank sensor solution.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Elkhart Plastics\/Ameri-Kart","offers":[{"title":"Default Title","offer_id":41646806139032,"sku":"5019","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/2B5DA90F-B6A1-406C-BA93-D5989FB2F990.png?v=1750437205"},{"product_id":"th-7-black-plug","title":"TH-7 Hex Socket Threaded Black Plug 1\/2 - 14\"","description":"\u003cp\u003eTH-7 Plastic Hex Socket Threaded Black Plug - Thread size 1\/2 - 14\"\u003c\/p\u003e\n\u003cp\u003ePlug threaded black HDPE hex socket 1\/2\" NPT Thread\u003c\/p\u003e\n\u003cp\u003eCaplugs ZTH71KA1 Plastic Hex Socket Threaded Plug. TH-7 size 1\/2\"-14\"\u003c\/p\u003e","brand":"Elkhart RV Parts","offers":[{"title":"Default Title","offer_id":41647414706328,"sku":"TH-7","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/products\/TH-7blackplugpic1.jpg?v=1648836214"},{"product_id":"4-1-2-patch-3-3-4-hole-size-part-69l","title":"4-1\/2\" Patch 3-3\/4\" Hole Size Part  # 69L","description":"\u003cp\u003e4-1\/2\" Patch (3-3\/4\" Hole Size)\u003c\/p\u003e\n\u003cp\u003e3.75\" Pilot x 4.50\" OD\u003c\/p\u003e\n\u003cp\u003ePart  # 69L\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41658128564376,"sku":"69L","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/4-1-2-patch-3-3-4-hole-size-part-69l-shopify-1_f0d83ea4-5dff-4c88-82f5-5a4d30ae34c8.jpg?v=1779178710"},{"product_id":"1-1-2-non-threaded-fitting-part-72-500236","title":"1-1\/2\" Non-thread fitting Part # 72","description":"\u003cp\u003e1-1\/2\" Non-threaded fitting\u003c\/p\u003e\n\u003cp\u003eOD x 1-1\/8\" ID x 2.100\" long\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpin Weld Fitting for RV Fresh Water and Holding Tanks \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003ePart # 72 (500236)\u003cbr\u003e\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41659626094744,"sku":"72\/500236","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/1-1-2-non-threaded-fitting-part-72-500236-shopify-1.jpg?v=1779177740"},{"product_id":"2-fpt-flush-spinweld-fitting-part-58","title":"2\" FPT Flush Spinweld Fitting - Part # 58","description":"\u003cp\u003e2\" FPT Flush Spinweld Fitting \u003c\/p\u003e\n\u003cp\u003ePart # 58 (500112)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41659637006488,"sku":"58","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/2-fpt-flush-spinweld-fitting-part-58-shopify-1.jpg?v=1779177871"},{"product_id":"o-ring-only-for-3-hub-adaptor-3-3-4-hole-size-part-300-oring","title":"CPI - O Ring Only for 3\" Hub Adaptor - 3 3\/4\" Hole Size - Part #300-O'RING","description":"\u003cp\u003eReplacement O Ring ONLY - use with #300 (500288) 3\" Hub Adaptor\u003c\/p\u003e\n\u003cp\u003ePart # 300 O Ring \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41659650834584,"sku":"300ORING","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/o-ring-only-for-3-hub-adaptor-3-3-4-hole-size-part-300-oring-shopify-1.jpg?v=1779181094"},{"product_id":"rv-holding-tank-fittings-kit-sensors-black-grey-water","title":"Elkhart RV Parts - Universal Holding Tank Fittings Kit - Black \u0026 Grey Water - 4 Sensors - 3\" \u0026 1.5\" Couplers - Complete DIY Installation Kit","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 16px; margin-bottom: 16px;\"\u003e\u003cspan style=\"color: #1d9bf0; font-weight: bold;\"\u003e✓ ElkhartRVParts.com - The Only Authorized Place for Elkhart Plastics Parts\u003c\/span\u003e\u003c\/div\u003e\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 16px; margin-bottom: 20px;\"\u003e\u003cspan style=\"color: #10b981; font-weight: bold;\"\u003e✓ 100% Verified Authentic OEM Grade Part\u003c\/span\u003e\u003c\/div\u003e\u003ch2\u003eComplete Universal Holding Tank Fittings Kit - Everything You Need for Professional Black \u0026amp; Grey Water Tank Installation\u003c\/h2\u003e\u003cp\u003eInstalling or customizing your RV holding tank has never been easier. This comprehensive universal fittings kit includes everything you need to outfit your black water or grey water tank with professional-grade fittings and accurate level sensors. Whether you're replacing a damaged tank, upgrading to a larger capacity, or building a custom RV system, this complete kit delivers OEM-quality components with detailed installation instructions that make the job straightforward for DIYers and professionals alike.\u003c\/p\u003e\u003ch2\u003eFeatures \u0026amp; Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 Horst Miracle Probe Sensors:\u003c\/strong\u003e Premium mini probe sensors (#A2A2) with hooded debris protection provide accurate 4-level monitoring (full, 3\/4, 1\/2, empty) so you always know your tank status\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 Probe Screen Covers:\u003c\/strong\u003e Protective covers (#311) shield sensors from debris and waste buildup, ensuring long-term accuracy and easy cleaning\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple Barbed Couplers:\u003c\/strong\u003e Includes 3x 1-1\/2\" ABS barbed couplers (#BI-B11150B) and 1x 3\" ABS barbed coupler (#BI-B1130B) for drain and vent connections\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatching Grommets:\u003c\/strong\u003e 3x 1-1\/2\" grommets (#BI-B1115) and 1x 3\" grommet (#BI-B113) create leak-proof seals for all fittings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Works with most RV black water and grey water holding tanks from all major manufacturers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM-Grade Quality:\u003c\/strong\u003e Same components used by RV manufacturers during original production - proven reliability you can trust\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Installation Guide:\u003c\/strong\u003e Detailed PDF instructions with step-by-step photos make installation simple (\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/ElkhartRVParts.com_Black_and_Grey_Water_Fitting_Kit_Installation.pdf?v=1739823077\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color: #dc2626; font-weight: bold;\"\u003eDownload Installation PDF\u003c\/a\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhy Choose This Universal Holding Tank Fittings Kit?\u003c\/h2\u003e\u003cp\u003eWhen you're investing in a new holding tank or repairing your existing system, the fittings you choose make all the difference between a leak-free installation that lasts for years and a frustrating project that requires constant repairs. This kit eliminates the guesswork by including every component you need in the correct sizes and quantities. The Horst Miracle Probe sensors are the industry standard for accuracy and durability, with hooded debris protection that prevents the false readings and sensor failures common with cheaper alternatives. The ABS barbed couplers and grommets create permanent, leak-proof connections that withstand the vibration and movement of RV travel without loosening or cracking. Whether you're a mobile RV technician outfitting customer tanks, a DIY enthusiast tackling your first tank installation, or an RV dealer preparing tanks for sale, this kit provides professional results with straightforward installation that doesn't require specialized tools or welding equipment.\u003c\/p\u003e\u003ch2\u003eCompare RV Tank Fittings Kits \u0026amp; Components\u003c\/h2\u003e\u003cp\u003eChoosing the right fittings for your RV tank project? Compare our complete kits and individual components:\u003c\/p\u003e\u003cdiv style=\"overflow-x: auto; margin: 20px 0;\"\u003e\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e5e7eb;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background-color: #dc2626; color: white;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eProduct\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eApplication\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eSensors Included\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eCouplers\/Grommets\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"border-left: 3px solid #dc2626; background-color: #fef2f2;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eHolding Tank Kit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eBlack \u0026amp; Grey Water\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e4 sensors + covers\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e3x 1.5\", 1x 3\" sets\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eComplete holding tank installation\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCurrent Product\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eFresh Water Kit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFresh Water\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e4 sensors\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eMultiple sizes (1\/2\" to 2\")\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFresh water tank installations\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/elkhart-rv-parts-universal-fresh-water-tank-fittings-kit-water-level-sensors\" style=\"color: #dc2626; font-weight: bold;\"\u003eView Fresh Kit\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003e3\" Barbed Coupler\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eHolding Tanks\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eNone\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eIndividual 3\" coupler\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eReplacement or additional 3\" fittings\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/3-barb-x-hub-coupler-black-u300bc\" style=\"color: #dc2626; font-weight: bold;\"\u003eView 3\" Coupler\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003e1.5\" Barbed Coupler\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eAll Tank Types\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eNone\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eIndividual 1.5\" coupler\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eReplacement or additional 1.5\" fittings\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/elkhart-plastics-1-5-barbed-hub-coupler-black-u150bc-rv-tank-fitting\" style=\"color: #dc2626; font-weight: bold;\"\u003eView 1.5\" Coupler\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 12px; margin-top: 16px;\"\u003e\u003cstrong\u003ePro Tip:\u003c\/strong\u003e This holding tank kit is optimized for black and grey water applications with the right mix of 1.5\" and 3\" fittings. For fresh water tanks, choose the Fresh Water Kit which includes multiple grommet sizes for universal compatibility.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\/SKU:\u003c\/strong\u003e ERVP-HOLDINGTANKKIT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Elkhart RV Parts (OEM-grade components)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Black water and grey water holding tanks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.2 lbs (complete kit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarcode\/UPC:\u003c\/strong\u003e 52243352\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHS Code:\u003c\/strong\u003e 391740\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's Included in the Kit\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e4x Probe Screen Covers (#311) - Enhanced sensor protection and accurate readings\u003c\/li\u003e\n\u003cli\u003e4x Horst Miracle Probe Mini Sensors (#A2A2) - With hooded debris protection\u003c\/li\u003e\n\u003cli\u003e3x 1-1\/2\" ABS Barbed Couplers (#BI-B11150B) - For vent and drain connections\u003c\/li\u003e\n\u003cli\u003e1x 3\" ABS Barbed Coupler (#BI-B1130B) - For main drain connection\u003c\/li\u003e\n\u003cli\u003e3x 1-1\/2\" Grommets (#BI-B1115) - Leak-proof seals for 1.5\" fittings\u003c\/li\u003e\n\u003cli\u003e1x 3\" Grommet (#BI-B113) - Leak-proof seal for 3\" fitting\u003c\/li\u003e\n\u003cli\u003eDetailed installation instructions with photos (\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/ElkhartRVParts.com_Black_and_Grey_Water_Fitting_Kit_Installation.pdf?v=1739823077\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color: #dc2626; font-weight: bold;\"\u003eDownload PDF\u003c\/a\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTools You'll Need (Not Included)\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e3\/8\" drill bit (for installing sensors)\u003c\/li\u003e\n\u003cli\u003e2-1\/2\" hole saw (for 1-1\/2\" grommets)\u003c\/li\u003e\n\u003cli\u003e4\" hole saw (for 3\" grommet)\u003c\/li\u003e\n\u003cli\u003eElectric or cordless drill\u003c\/li\u003e\n\u003cli\u003eSafety goggles\u003c\/li\u003e\n\u003cli\u003eTape measure\u003c\/li\u003e\n\u003cli\u003eDish soap or hand soap (for installation)\u003c\/li\u003e\n\u003cli\u003eDeburring tool (knife or sandpaper works too)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Overview\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eInstalling Grommets \u0026amp; Barbed Couplers:\u003c\/strong\u003e\u003c\/p\u003e\u003col\u003e\n\u003cli\u003eMark tank exactly where you want fittings (double-check measurements)\u003c\/li\u003e\n\u003cli\u003eMake starter hole for hole saw\u003c\/li\u003e\n\u003cli\u003eCut tank hole with appropriate hole saw (2-1\/2\" or 4\")\u003c\/li\u003e\n\u003cli\u003eDeburr hole thoroughly for tight seal\u003c\/li\u003e\n\u003cli\u003ePush short end of grommet into hole until flush\u003c\/li\u003e\n\u003cli\u003eApply dish soap to barbed coupler and push into grommet until it snaps and locks\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003e\u003cstrong\u003eInstalling Level Sensors:\u003c\/strong\u003e\u003c\/p\u003e\u003col\u003e\n\u003cli\u003eMark sensor positions at end of tank (keep finger-width from edges)\u003c\/li\u003e\n\u003cli\u003eStandard formation: Top center (full), middle-side (half), bottom corner (empty), bottom center (empty)\u003c\/li\u003e\n\u003cli\u003eDrill 3\/8\" holes and remove burrs\u003c\/li\u003e\n\u003cli\u003ePush probe sensor into hole, wiggle into place, twist nut to tighten\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003e\u003cem\u003eFull detailed instructions with photos included in kit and available in \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/ElkhartRVParts.com_Black_and_Grey_Water_Fitting_Kit_Installation.pdf?v=1739823077\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color: #dc2626; font-weight: bold;\"\u003edownloadable PDF format\u003c\/a\u003e.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eProfessional Spin Weld Installation Available\u003c\/h2\u003e\u003cp\u003eDon't want to tackle this as a DIY project? We offer professional custom spin weld installation services! See our \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/custom-fittings-install-service-we-will-spin-weld-into-tank-you-are-purchasing-today-up-to-5-parts\" style=\"color: #dc2626; font-weight: bold;\"\u003ecustom installation options here\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy choose our custom tank welding process?\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Certified Application:\u003c\/strong\u003e Same process used by RV manufacturers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePermanent Leak-Proof:\u003c\/strong\u003e Spin welding eliminates seams and voids at stress points\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple QC Check:\u003c\/strong\u003e Impact proof, air tight, and water tight testing on every tank\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional Results:\u003c\/strong\u003e Get it right the first time with our trained technicians\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatible Models \u0026amp; Alternatives\u003c\/h2\u003e\u003cp\u003eThis kit works with most RV black water and grey water holding tanks. Looking for related components? Browse our complete selection of \u003ca href=\"https:\/\/elkhartrvparts.com\/collections\/rv-tank-fittings\" style=\"color: #dc2626; font-weight: bold;\"\u003eRV Tank Fittings\u003c\/a\u003e. For fresh water tank installations, check out our \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/elkhart-rv-parts-universal-fresh-water-tank-fittings-kit-water-level-sensors\" style=\"color: #dc2626; font-weight: bold;\"\u003eUniversal Fresh Water Tank Fittings Kit\u003c\/a\u003e. Need individual replacement components? We stock \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/3-barb-x-hub-coupler-black-u300bc\" style=\"color: #dc2626; font-weight: bold;\"\u003e3\" barbed couplers\u003c\/a\u003e and \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/elkhart-plastics-1-5-barbed-hub-coupler-black-u150bc-rv-tank-fitting\" style=\"color: #dc2626; font-weight: bold;\"\u003e1.5\" barbed couplers\u003c\/a\u003e separately.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need the holding tank kit or fresh water kit?\u003c\/strong\u003e\u003cbr\u003eThis holding tank kit is designed for black water and grey water tanks with the right mix of 1.5\" and 3\" fittings for typical waste tank configurations. The fresh water kit includes multiple grommet sizes (1\/2\" to 2\") for potable water applications. Choose based on your tank type.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install this kit myself or do I need professional help?\u003c\/strong\u003e\u003cbr\u003eMost DIYers with basic tools and mechanical skills can complete this installation following our detailed instructions. The process involves drilling holes, installing grommets, and mounting sensors - no welding required. For permanent leak-proof installation, consider our professional spin weld service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill these sensors work with my existing tank monitor panel?\u003c\/strong\u003e\u003cbr\u003eThe Horst Miracle Probe sensors are compatible with most standard RV tank monitoring systems. Verify your monitor panel accepts standard probe-style sensors before installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat's the difference between barbed couplers and threaded fittings?\u003c\/strong\u003e\u003cbr\u003eBarbed couplers use grommets to create leak-proof seals and connect to flexible hose with hose clamps. They're easier to install than threaded fittings and don't require pipe thread sealant. The barbed design grips hose securely for vibration-resistant connections.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow accurate are the Horst Miracle Probe sensors?\u003c\/strong\u003e\u003cbr\u003eHorst Miracle Probes are industry-standard sensors known for accuracy and reliability. The hooded debris protection prevents false readings from waste buildup, and the screen covers provide additional protection for long-term accuracy.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I add more sensors than what's included in the kit?\u003c\/strong\u003e\u003cbr\u003eYes! You can purchase additional sensors separately if you want more monitoring points. The standard 4-sensor configuration (full, 3\/4, 1\/2, empty) works well for most applications.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Elkhart RV Parts?\u003c\/h2\u003e\u003cp\u003eAs the only authorized dealer for Elkhart Plastics and CPI components, we guarantee 100% authentic OEM-grade parts - never knockoffs or inferior substitutes. This kit includes the same components used by RV manufacturers during original production. We maintain deep inventory for fast shipping, provide expert technical support, and offer professional spin weld installation services for customers who want permanent, leak-proof results. Our team understands RV tank systems and can help you select the right components for any installation or repair project.\u003c\/p\u003e\u003cdiv style=\"background-color: #fef2f2; border-left: 4px solid #dc2626; padding: 16px; margin: 24px 0;\"\u003e\u003cp style=\"margin: 0; font-weight: bold; color: #dc2626;\"\u003eReady to complete your RV holding tank installation with professional-grade fittings and accurate level monitoring? Order this complete kit now for fast shipping and get everything you need in one package. Questions about installation or compatibility? Our AI Live Chat has deep product knowledge and can help you with technical guidance and fitment questions.\u003c\/p\u003e\u003c\/div\u003e","brand":"Elkhart RV Parts","offers":[{"title":"Default Title","offer_id":42136552243352,"sku":"ERVP-HOLDINGTANKKIT","price":44.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/C5643B1E-5155-4602-AAAB-08E7965A1613.jpg?v=1739821925"},{"product_id":"elkhart-rv-parts-universal-fresh-water-tank-fittings-kit-water-level-sensors","title":"Elkhart RV Parts - Universal Fresh Water Tank Fittings Kit with Water Level Sensors for RV Tanks","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #1d9bf0; font-weight: bold;\"\u003e✓ ElkhartRVParts.com - The Only Authorized Place for Elkhart RV Parts Products\u003c\/p\u003e\u003c\/div\u003e\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #10b981; font-weight: bold;\"\u003e✓ 100% Verified Authentic OEM Grade Part\u003c\/p\u003e\u003c\/div\u003e\u003ch2\u003eUniversal Fresh Water Tank Fittings Kit with Water Level Sensors\u003c\/h2\u003e\u003cp\u003eComplete your RV fresh water tank installation with this comprehensive fittings kit designed for DIY enthusiasts and professional installers. Whether you're replacing an existing tank or installing a new one, this universal kit includes everything you need to customize your tank with proper fittings and accurate water level monitoring.\u003c\/p\u003e\u003ch2\u003eComplete Kit for Custom Tank Installation\u003c\/h2\u003e\u003cp\u003eThis professional-grade fittings kit is specifically designed for RV fresh water tanks and includes multiple grommet sizes to accommodate standard PVC piping connections plus four water level sensors for accurate tank monitoring. Perfect for anyone purchasing a replacement or upgrade water tank who needs to install fittings specific to their RV's plumbing configuration.\u003c\/p\u003e\u003ch3\u003eWhat's Included in the Kit\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 Mini Probe\/Sensor Tank Inserts\u003c\/strong\u003e - Requires 3\/8\" drill bit for installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x 1\/2\" Grommets (U50W)\u003c\/strong\u003e - Requires 1-1\/4\" hole saw (white or black, functionally identical)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x 3\/4\" Grommets (U100W)\u003c\/strong\u003e - Requires 1-1\/4\" hole saw (white or black, functionally identical)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x 1\" Grommets (U075W)\u003c\/strong\u003e - Requires 1-3\/4\" hole saw (white or black, functionally identical)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x 1-1\/2\" Grommets (U150W)\u003c\/strong\u003e - Requires 2-1\/2\" hole saw (white or black, functionally identical)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x 2\" Grommet (U200W)\u003c\/strong\u003e - Requires 3\" hole saw (white or black, functionally identical)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eNote: Actual fittings may be a combination of white or black grommets, but all are functionally identical and meet the same quality standards.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eTools You'll Need (Not Included)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1-1\/4\" hole saw (for 1\/2\" and 3\/4\" grommets)\u003c\/li\u003e\n\u003cli\u003e1-3\/4\" hole saw (for 1\" grommets)\u003c\/li\u003e\n\u003cli\u003e2-1\/2\" hole saw (for 1-1\/2\" grommets)\u003c\/li\u003e\n\u003cli\u003e3\" hole saw (for 2\" grommets)\u003c\/li\u003e\n\u003cli\u003e3\/8\" drill bit (for probe\/sensor installation)\u003c\/li\u003e\n\u003cli\u003eElectric or cordless drill\u003c\/li\u003e\n\u003cli\u003eSafety goggles\u003c\/li\u003e\n\u003cli\u003eTape measure\u003c\/li\u003e\n\u003cli\u003eDeburring tool (knife or rough sandpaper works)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eStep-by-Step Installation Guide\u003c\/h2\u003e\u003ch3\u003eInstalling Grommets\u003c\/h3\u003e\u003cp\u003eYour pipe size will determine which grommet sizes you need to install. Follow these steps for a leak-proof seal:\u003c\/p\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eMark the Tank\u003c\/strong\u003e - Measure and mark exactly where you want to place each grommet (double-check measurements to prevent errors)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCreate Starter Hole\u003c\/strong\u003e - Make a pilot hole for your hole saw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut the Hole\u003c\/strong\u003e - Use the appropriate hole saw to cut the tank opening\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeburr the Hole\u003c\/strong\u003e - Remove all rough edges to ensure a tight seal (critical step)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Grommet\u003c\/strong\u003e - Push the short end of the grommet into the hole until flush, checking all sides for proper seating\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eInstalling Water Level Sensors\u003c\/h3\u003e\u003cp\u003eSensors measure water levels and help you monitor tank capacity. Keep sensors at least a finger's width from edges for proper sealing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eStandard Sensor Placement:\u003c\/strong\u003e\u003c\/p\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop Sensor (Full Tank)\u003c\/strong\u003e - Place at the end of tank at top center to measure when tank is full\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMiddle Sensor (Half Full)\u003c\/strong\u003e - Place at middle end of tank between center and side to measure half-way point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBottom Right Sensor (Empty)\u003c\/strong\u003e - Place at bottom towards right corner to measure low level\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBottom Center Sensor (Empty)\u003c\/strong\u003e - Place at bottom towards center for secondary empty reading\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003e\u003cstrong\u003eInstallation Steps:\u003c\/strong\u003e\u003c\/p\u003e\u003col\u003e\n\u003cli\u003eMark the tank exactly where you want to place each probe (verify measurements)\u003c\/li\u003e\n\u003cli\u003eDrill the 4 holes using your 3\/8\" drill bit and remove any burrs for a tight seal\u003c\/li\u003e\n\u003cli\u003ePush probe sensor into the hole, wiggling into place, then twist nut to tighten\u003c\/li\u003e\n\u003c\/ol\u003e\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #dc2626; padding: 15px; margin: 20px 0;\"\u003e\u003cp style=\"margin: 0; font-weight: bold;\"\u003e📋 \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/ElkhartRVParts.com_Fresh_Water_Fitting_Kit_Installation.pdf?v=1739811328\" target=\"_blank\" style=\"color: #dc2626;\"\u003eDownload Complete Installation Guide (PDF)\u003c\/a\u003e\u003c\/p\u003e\u003c\/div\u003e\u003ch2\u003eProfessional Installation Service Available\u003c\/h2\u003e\u003cp\u003eDon't want to tackle this DIY project yourself? We offer professional custom fittings installation service where we'll spin weld the fittings directly into your tank before shipping.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/custom-fittings-install-service-we-will-spin-weld-into-tank-you-are-purchasing-today-up-to-5-parts\" style=\"font-weight: bold; color: #dc2626;\"\u003eView Custom Installation Service (Up to 5 Fittings) →\u003c\/a\u003e\u003c\/p\u003e\u003ch3\u003ePremium OEM-Quality Components\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% Authentic OEM-Quality Parts\u003c\/strong\u003e - Crafted to meet or exceed factory standards for reliable performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFDA-Approved Materials\u003c\/strong\u003e - Made from high-quality, durable polyethylene fully approved for safe drinking water storage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility\u003c\/strong\u003e - Works with rotational molded fresh water tanks for RVs, horse trailers, and marine vessels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeak-Proof Design\u003c\/strong\u003e - Engineered for superior strength and reliable sealing when properly installed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion Resistant\u003c\/strong\u003e - Designed to stay functional for years of dependable service\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eComplete Your RV Tank System\u003c\/h3\u003e\u003cp\u003eLooking for tanks to go with your fittings kit? We carry a full range of RV water tanks and related products:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/10-gallon-rv-fresh-water-tank-17-x-14-x-10-t161\"\u003e10 Gallon RV Fresh Water Tank (17x14x10)\u003c\/a\u003e - Compact size for smaller RVs\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/elkhartrvparts.com\/collections\/motorhome-water-tanks-for-sale-rv-fresh-water-solutions\"\u003eBrowse All Fresh Water Tanks\u003c\/a\u003e - Complete selection of sizes and configurations\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/elkhartrvparts.com\/collections\/rv-water-tank-monitors-probes\"\u003eRV Water Tank Monitors \u0026amp; Probes\u003c\/a\u003e - Replacement sensors and monitoring equipment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eNeed Black or Gray Water Tank Fittings?\u003c\/h3\u003e\u003cp\u003eWe also offer a complete fittings kit specifically designed for RV holding tanks (black water and gray water):\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/universal-holding-tank-fittings-kit-w-level-sensors-for-black-water-and-grey-water-rv-tanks\" style=\"font-weight: bold; color: #dc2626;\"\u003eUniversal Holding Tank Fittings Kit for Black \u0026amp; Gray Water Tanks →\u003c\/a\u003e\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWill this kit work with any fresh water tank?\u003c\/strong\u003e\u003cbr\u003eYes, this is a universal kit designed to work with standard rotational molded RV fresh water tanks. The multiple grommet sizes accommodate various pipe diameters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use this kit for black or gray water tanks?\u003c\/strong\u003e\u003cbr\u003eWhile the grommets are universal, we recommend our dedicated \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/universal-holding-tank-fittings-kit-w-level-sensors-for-black-water-and-grey-water-rv-tanks\"\u003eholding tank fittings kit\u003c\/a\u003e for black and gray water applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need all the grommets in the kit?\u003c\/strong\u003e\u003cbr\u003eNot necessarily. Install only the grommet sizes that match your specific plumbing pipe diameters. Extra grommets can be kept as spares.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow accurate are the water level sensors?\u003c\/strong\u003e\u003cbr\u003eWhen properly installed according to the standard placement guide, the sensors provide reliable 4-level monitoring (full, half, low, empty).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat if I make a mistake drilling the holes?\u003c\/strong\u003e\u003cbr\u003eMeasure twice, drill once! Use the included installation guide and take your time marking locations. If you're not confident in DIY installation, consider our professional installation service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre the white and black grommets different?\u003c\/strong\u003e\u003cbr\u003eNo, they are functionally identical. Color variation is due to manufacturing batches, but performance and quality are the same.\u003c\/p\u003e\u003ch3\u003eWhy Buy from Elkhart RV Parts?\u003c\/h3\u003e\u003cp\u003eWe specialize in OEM-grade RV water tank systems and components. Every fittings kit includes authentic, high-quality parts designed for long-term reliability. Our detailed installation guides and optional professional installation service ensure your tank system is installed correctly the first time.\u003c\/p\u003e\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #dc2626; padding: 15px; margin-top: 20px;\"\u003e\n\u003cp style=\"margin: 0; font-weight: bold; color: #dc2626;\"\u003e🚚 Fast Shipping - In-stock items ship quickly\u003c\/p\u003e\n\u003cp style=\"margin: 10px 0 0 0;\"\u003eNeed help selecting the right fittings or have installation questions? Use our AI Live Chat for instant assistance with deep product knowledge and technical guidance.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Elkhart RV Parts","offers":[{"title":"Default Title","offer_id":42136772116632,"sku":"ERVP-FRESHTANKKIT","price":44.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/01A62D01-7CFE-4780-9CF9-F851FD41F891.jpg?v=1740066364"},{"product_id":"1-1-2-uniseal-grommet-white-u150-w","title":"1-1\/2\" Uniseal Grommet - White  U150-W","description":"\u003cdiv data-mce-fragment=\"1\"\u003e1-1\/2\" Uniseal Grommet - White  U150-W\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\" class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003e\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003eThis grommet will connect your PVC Schedule 40 pipe to your tank and create a seal on your tank that will last!\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003eFitting Specifications:\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cul\u003e\n\u003cli\u003ePipe ID - 1.5\" (38mm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePipe OD -\u003cspan\u003e \u003c\/span\u003e\u003cspan id=\"ctl00_cph1_lblDescription\"\u003e1.90\"\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e(48mm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHole Saw size: 2.5\" (63mm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUp to 3\/8\" Wall Thickness. (9mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003eSold in Each and made in the USA\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\" class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003e\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003eInstallation tips:  Measure twice and after cutting your hole, smooth out any rough edges to get the best seal.\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\" class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003e\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cbr\u003e\n\u003cdiv\u003e\n\u003cspan class=\"Polaris-TextStyle--variationStrong_rpyvj\"\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"The Uniseal Warehouse","offers":[{"title":"Default Title","offer_id":42237057073304,"sku":"U150-W","price":5.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/1-1-2-uniseal-grommet-white-u150-w-shopify-1.jpg?v=1779182231"},{"product_id":"2-inch-uniseal-grommet-white-pvc-schedule-40-tank-fitting-u200-w","title":"The Uniseal Warehouse - 2\" Uniseal Grommet - White - PVC Schedule 40 Pipe Tank Fitting - 3\" Hole Saw - U200-W","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #1d9bf0; font-weight: bold;\"\u003e✓ \u003cstrong\u003eElkhartRVParts.com - The Only Authorized Place for The Uniseal Warehouse\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #10b981; font-weight: bold;\"\u003e✓ \u003cstrong\u003e100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\u003cp\u003eLooking for a reliable, leak-proof connection between your PVC pipe and RV holding tank? The 2\" Uniseal Grommet (U200-W) creates a watertight seal that lasts for years without the need for adhesives, clamps, or threading. This USA-made tank fitting is the professional's choice for fresh water tanks, holding tanks, and custom RV plumbing installations.\u003c\/p\u003e\u003ch2\u003eFeatures \u0026amp; Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" PVC Schedule 40 Compatibility:\u003c\/strong\u003e Designed for pipes with 2\" inner diameter (50mm) and 2.375\" outer diameter (60mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Requires only a 3\" (76mm) hole saw - no threading, gluing, or special tools needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupports Thick Tank Walls:\u003c\/strong\u003e Works with tank wall thickness up to 3\/8\" (9mm) for versatile applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable White Construction:\u003c\/strong\u003e UV-resistant material maintains seal integrity in harsh RV environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in USA:\u003c\/strong\u003e Premium quality manufacturing with rigorous quality control standards\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeak-Proof Design:\u003c\/strong\u003e Creates compression seal that flexes with temperature changes and vibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHighly Rated:\u003c\/strong\u003e 4.9\/5 stars from verified customers who trust this fitting for critical applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhy Choose the 2\" Uniseal Grommet?\u003c\/h2\u003e\u003cp\u003eTraditional threaded tank fittings can crack, leak, or fail over time due to vibration and thermal expansion in RV applications. The 2\" Uniseal Grommet solves these problems with a flexible, compression-based seal that adapts to movement and temperature changes. Unlike spin-weld fittings that require specialized equipment, Uniseals install in minutes with just a drill and hole saw. The white color blends seamlessly with most RV tanks while providing UV resistance for long-term durability. Whether you're building a custom fresh water system, repairing a holding tank, or upgrading your RV plumbing, this grommet delivers professional-grade performance without the professional installation cost.\u003c\/p\u003e\u003ch2\u003eCompare Uniseal Grommets\u003c\/h2\u003e\u003cp\u003eChoose the right Uniseal grommet size for your PVC Schedule 40 pipe application. All models feature the same USA-made quality and tool-free installation.\u003c\/p\u003e\u003cdiv style=\"overflow-x: auto;\"\u003e\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background-color: #dc2626; color: white;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003ePipe ID\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003ePipe OD\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eHole Saw\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003e1\" White (U100-W)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e1\" (25mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e1.315\" (33mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e1.75\" (44mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003eVent lines, small drain applications\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/1-uniseal-grommet-white-u100-w\" style=\"color: #dc2626;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fef2f2; border-left: 3px solid #dc2626;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e\n\u003cstrong\u003e2\" White (U200-W)\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color: #dc2626; font-size: 12px;\"\u003e← YOU ARE HERE\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e2\" (50mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e2.375\" (60mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e3\" (76mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003eStandard RV tank drains, fill lines\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCurrent Product\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003e1-1\/2\" White (U150-W)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e1.5\" (38mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e1.9\" (48mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e2.5\" (63mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003eMedium flow applications, sensor ports\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/1-1-2-uniseal-grommet-white-u150-w\" style=\"color: #dc2626;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e\u003cstrong\u003e3\" Black (U300)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e3\" (76mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e3.5\" (89mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e4\" (101mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003eHigh-flow drains, large tank applications\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/3-uniseal-grommet-black-u300\" style=\"color: #dc2626;\"\u003eView Product\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp style=\"background-color: #f3f4f6; padding: 12px; border-left: 3px solid #dc2626; margin: 15px 0;\"\u003e\u003cstrong\u003e💡 Pro Tip:\u003c\/strong\u003e All Uniseal grommets support tank walls up to 3\/8\" thick. Choose your size based on the PVC Schedule 40 pipe outer diameter you're using.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb; background-color: #f9fafb;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb;\"\u003eU200-W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb; background-color: #f9fafb;\"\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb;\"\u003eWhite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb; background-color: #f9fafb;\"\u003e\u003cstrong\u003ePipe Inner Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb;\"\u003e2 inches (50mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb; background-color: #f9fafb;\"\u003e\u003cstrong\u003ePipe Outer Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb;\"\u003e2.375 inches (60mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb; background-color: #f9fafb;\"\u003e\u003cstrong\u003eRequired Hole Saw Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb;\"\u003e3 inches (76mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb; background-color: #f9fafb;\"\u003e\u003cstrong\u003eMaximum Tank Wall Thickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb;\"\u003e3\/8 inch (9mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb; background-color: #f9fafb;\"\u003e\u003cstrong\u003eCompatible Pipe Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb;\"\u003ePVC Schedule 40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb; background-color: #f9fafb;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb;\"\u003eUV-Resistant Thermoplastic Elastomer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb; background-color: #f9fafb;\"\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb;\"\u003eMade in USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb; background-color: #f9fafb;\"\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #e5e7eb;\"\u003eCompression seal (no adhesives required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's Included\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eOne (1) 2\" Uniseal Grommet in White (U200-W)\u003c\/li\u003e\n\u003cli\u003eInstallation is simple: drill 3\" hole, insert grommet, push pipe through for instant seal\u003c\/li\u003e\n\u003cli\u003eBacked by manufacturer quality guarantee\u003c\/li\u003e\n\u003cli\u003e30-day return policy for your peace of mind\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasure and Mark:\u003c\/strong\u003e Determine the location on your tank where the pipe will enter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill the Hole:\u003c\/strong\u003e Use a 3\" (76mm) hole saw to create a clean, round opening\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert the Grommet:\u003c\/strong\u003e Push the Uniseal grommet into the hole from the outside of the tank\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall the Pipe:\u003c\/strong\u003e Lubricate the pipe end with soapy water and push it through the grommet until fully seated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest the Seal:\u003c\/strong\u003e The compression fit creates an immediate watertight seal - no curing time needed\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch2\u003eCompatible Models \u0026amp; Alternatives\u003c\/h2\u003e\u003cp\u003eLooking for related products to complete your RV tank installation?\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDifferent Sizes:\u003c\/strong\u003e Browse our complete \u003ca href=\"https:\/\/elkhartrvparts.com\/collections\/vendors?q=The+Uniseal+Warehouse\" style=\"color: #dc2626;\"\u003eUniseal Grommet Collection\u003c\/a\u003e for 1\/2\", 3\/4\", 1\", 1-1\/2\", and 3\" options\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarbed Couplers:\u003c\/strong\u003e Pair with barbed hub couplers for secure hose connections to your Uniseal installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePVC Pipe:\u003c\/strong\u003e Use with standard PVC Schedule 40 pipe available at any hardware store\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank Fittings:\u003c\/strong\u003e Explore our full selection of \u003ca href=\"https:\/\/elkhartrvparts.com\/collections\/tank-fittings\" style=\"color: #dc2626;\"\u003eRV Tank Fittings\u003c\/a\u003e for complete plumbing solutions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eHow do I install a 2\" Uniseal grommet in my RV tank?\u003c\/h3\u003e\u003cp\u003eInstallation is simple and requires no special tools beyond a drill and 3\" hole saw. Drill a clean 3\" hole in your tank wall, insert the Uniseal grommet from the outside, then push your 2\" PVC Schedule 40 pipe through the grommet using soapy water as lubricant. The compression seal is immediate and watertight.\u003c\/p\u003e\u003ch3\u003eIs this compatible with my 2\" PVC pipe?\u003c\/h3\u003e\u003cp\u003eYes, this grommet is specifically designed for 2\" PVC Schedule 40 pipe, which has an outer diameter of 2.375\". It will NOT fit 2\" nominal pipe with different wall thicknesses or non-standard dimensions. Always verify your pipe is Schedule 40 before ordering.\u003c\/p\u003e\u003ch3\u003eWhat's the maximum tank wall thickness this grommet supports?\u003c\/h3\u003e\u003cp\u003eThe 2\" Uniseal grommet works with tank walls up to 3\/8\" (9mm) thick. This covers most RV holding tanks, fresh water tanks, and polyethylene storage tanks. For thicker walls, contact us for alternative fitting solutions.\u003c\/p\u003e\u003ch3\u003eDo I need to use sealant or adhesive with this grommet?\u003c\/h3\u003e\u003cp\u003eNo adhesives, sealants, or clamps are required. The Uniseal creates a watertight compression seal through its flexible design. Using soapy water during installation helps the pipe slide through easily, but the seal itself requires no additional products.\u003c\/p\u003e\u003ch3\u003eCan I remove and reuse this grommet if I need to replace the pipe?\u003c\/h3\u003e\u003cp\u003eYes, one of the major advantages of Uniseal grommets is that they're reusable. You can pull the pipe out and insert a new one without damaging the grommet or needing to replace it, making repairs and modifications much easier than permanent fittings.\u003c\/p\u003e\u003ch3\u003eWill this work with my black water or grey water holding tank?\u003c\/h3\u003e\u003cp\u003eAbsolutely. Uniseal grommets are chemical-resistant and work perfectly with fresh water, grey water, and black water applications. The white color is UV-resistant and won't degrade from exposure to tank chemicals or sunlight.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Elkhart RV Parts?\u003c\/h2\u003e\u003cp\u003eAs an authorized dealer for The Uniseal Warehouse, we guarantee 100% authentic OEM-grade products. Every Uniseal grommet we sell is made in the USA with the same quality standards trusted by professional RV manufacturers and repair shops. We offer fast shipping, expert customer support, and a 30-day return policy so you can shop with confidence. Our team understands RV plumbing systems and can help you choose the right fittings for your specific application.\u003c\/p\u003e\u003cdiv style=\"background-color: #fef2f2; border-left: 4px solid #dc2626; padding: 15px; margin: 20px 0;\"\u003e\u003cp style=\"margin: 0; font-weight: bold; color: #dc2626;\"\u003eReady to create a leak-proof tank connection? Add this 2\" Uniseal Grommet to your cart now and get fast shipping! Questions? Our AI Live Chat is here to help you choose the right fitting for your RV.\u003c\/p\u003e\u003c\/div\u003e","brand":"The Uniseal Warehouse","offers":[{"title":"Default Title","offer_id":42237059432600,"sku":"U200-W","price":4.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/2-inch-uniseal-grommet-white-pvc-schedule-40-tank-fitting-u200-w-shopify-1.jpg?v=1779182300"},{"product_id":"1-1-2-uniseal-grommet-black-u150","title":"1-1\/2\" Uniseal Grommet - Black  U150","description":"\u003cdiv data-mce-fragment=\"1\"\u003e1-1\/2\" Uniseal Grommet - Black  U150\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003eThis grommet will connect your PVC Schedule 40 pipe to your tank and create a seal on your tank that will last!\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cp\u003e \u003cspan\u003eFitting Specifications:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePipe ID - 1.5\" (38mm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePipe OD -\u003cspan\u003e \u003c\/span\u003e\u003cspan id=\"ctl00_cph1_lblDescription\"\u003e1.90\"\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e(48mm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHole Saw size: 2.5\" (63mm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUp to 3\/8\" Wall Thickness. (9mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003eSold in Each and made in the USA\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003eInstallation tips:  Measure twice and after cutting your hole, smooth out any rough edges to get the best seal.\u003c\/span\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cbr\u003e\n\u003cdiv\u003e\n\u003cspan class=\"Polaris-TextStyle--variationStrong_rpyvj\"\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"The Uniseal Warehouse","offers":[{"title":"Default Title","offer_id":42237061955736,"sku":"U150","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/1-1-2-uniseal-grommet-black-u150-shopify-1.jpg?v=1779182232"},{"product_id":"3-uniseal-grommet-black-u300","title":"3\" Uniseal Grommet - Black  U300","description":"\u003cdiv data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e3\" Uniseal Grommet - Black  U300\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003eThis grommet will connect your PVC Schedule 40 pipe to your tank and create a seal on your tank that will last!\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cp\u003e\u003cspan\u003eFitting Specifications:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePipe ID - 3\" (76mm)\u003c\/li\u003e\n\u003cli\u003ePipe OD -\u003cspan\u003e \u003c\/span\u003e\u003cspan id=\"ctl00_cph1_lblDescription\"\u003e3.500\"\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e(89mm)\u003c\/li\u003e\n\u003cli\u003eHole Saw size: 4\" (101mm)\u003c\/li\u003e\n\u003cli\u003eUp to 3\/8\" Wall Thickness. (9mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003eSold in Each and made in the USA\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003eInstallation tips:  Measure twice and after cutting your hole, smooth out any rough edges to get the best seal.\u003c\/span\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv\u003e\u003cspan class=\"Polaris-TextStyle--variationStrong_rpyvj\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e","brand":"The Uniseal Warehouse","offers":[{"title":"Default Title","offer_id":42237068705944,"sku":"U300","price":6.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-uniseal-grommet-black-u300-shopify-1.jpg?v=1779182728"},{"product_id":"3-barb-x-hub-coupler-black-u300bc","title":"3\" Barbed Coupler for RV Holding Tanks","description":"\u003cdiv data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003eThis 3\" Barb x Hub Coupler can be used with our 3\" Uniseal Grommet # U300\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\n\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003c\/div\u003e\n\u003cbr\u003e\n\u003cdiv\u003e\u003cspan class=\"Polaris-TextStyle--variationStrong_rpyvj\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"Elkhart Plastics\/Ameri-Kart","offers":[{"title":"Default Title","offer_id":42237072605336,"sku":"131B","price":12.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-barb-x-hub-coupler-black-u300bc-shopify-1.jpg?v=1779182473"},{"product_id":"elkhart-plastics-1-5-barbed-hub-coupler-black-u150bc-rv-tank-fitting","title":"Elkhart Plastics - 1.5\" Barbed Hub Coupler Black U150BC - RV Tank Fitting for Uniseal Grommet","description":"\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #1d9bf0; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #1d9bf0; font-weight: bold;\"\u003e✓ ElkhartRVParts.com - The Only Authorized Place for Elkhart Plastics\/Ameri-Kart\u003c\/p\u003e\u003c\/div\u003e\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #10b981; padding: 15px; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0; color: #10b981; font-weight: bold;\"\u003e✓ 100% Verified Authentic OEM Grade Part\u003c\/p\u003e\u003c\/div\u003e\u003ch2\u003eElkhart Plastics 1.5\" Barbed Hub Coupler - Essential RV Tank Fitting\u003c\/h2\u003e\u003cp\u003eThe Elkhart Plastics 1.5\" Barbed Hub Coupler (Model U150BC) is a premium OEM-grade fitting designed specifically for RV fresh water tanks, holding tanks, and gray water systems. This hard-to-find black plastic coupler provides a secure, leak-free connection when used with the 1.5\" Uniseal Grommet (U150), making it an essential component for RV plumbing repairs, upgrades, and new installations.\u003c\/p\u003e\u003cp\u003eWhether you're repairing a leaking tank fitting, upgrading your RV's water system, or installing new plumbing connections, this barbed hub coupler delivers the reliability and durability you need for worry-free travels. Manufactured by Elkhart Plastics\/Ameri-Kart, a trusted name in RV components, this fitting meets OEM specifications for quality and performance.\u003c\/p\u003e\u003ch2\u003eKey Features and Benefits\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eOEM-Quality Construction:\u003c\/strong\u003e Manufactured by Elkhart Plastics\/Ameri-Kart to exact OEM specifications, ensuring perfect fit and long-lasting performance in demanding RV applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePerfect Compatibility:\u003c\/strong\u003e Designed to work seamlessly with 1.5\" Uniseal Grommet (Model U150) for secure, watertight connections in RV tank installations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eVersatile Applications:\u003c\/strong\u003e Ideal for fresh water tanks, holding tanks, gray water tanks, drainage pipes, and exhaust pipe connections in RVs, campers, motorhomes, and travel trailers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHard-to-Find Part:\u003c\/strong\u003e Not available at local hardware stores - this specialized RV fitting is designed specifically for recreational vehicle plumbing systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDurable Black Finish:\u003c\/strong\u003e UV-resistant black plastic construction withstands temperature extremes, chemicals, and the rigors of RV life for years of reliable service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Barbed design creates a secure grip on flexible hose while the hub end provides a solid connection point for tank penetrations when used with Uniseal grommets.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e U150BC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1.5 inches (1-1\/2\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Barbed Hub Coupler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-grade plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible With:\u003c\/strong\u003e 1.5\" Uniseal Grommet (U150)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 190B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarcode:\u003c\/strong\u003e 75914904\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.5 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Elkhart Plastics\/Ameri-Kart\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Applications and Use Cases\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eRV Fresh Water Tank Connections:\u003c\/strong\u003e Create secure plumbing connections for fresh water tank fill lines, vent lines, and outlet connections.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHolding Tank Repairs:\u003c\/strong\u003e Replace damaged or worn fittings on black water and gray water holding tanks to restore leak-free operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTank Sensor Installation:\u003c\/strong\u003e Ideal for installing tank level sensors and monitoring equipment through tank walls using Uniseal grommets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDrainage System Upgrades:\u003c\/strong\u003e Perfect for connecting drainage pipes and waste water lines in RV plumbing systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eVent Pipe Connections:\u003c\/strong\u003e Use for secure connections in tank vent systems to prevent odors and maintain proper tank pressure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDIY RV Modifications:\u003c\/strong\u003e Essential component for custom RV plumbing projects, tank installations, and system upgrades.\u003c\/p\u003e\u003ch2\u003eWhy Choose This Barbed Hub Coupler\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAuthentic OEM Part:\u003c\/strong\u003e Unlike generic hardware store fittings, this is a genuine Elkhart Plastics component designed specifically for RV applications with proper sizing and materials for tank installations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eProven Reliability:\u003c\/strong\u003e With an average customer rating of 4.5 stars from 8 verified reviews, RV owners trust this fitting for critical plumbing repairs and installations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eProfessional-Grade Quality:\u003c\/strong\u003e The same fitting used by RV manufacturers and professional repair shops - now available directly to DIY RV owners.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePerfect Fit Guarantee:\u003c\/strong\u003e Engineered to work perfectly with 1.5\" Uniseal grommets for secure, leak-free tank penetrations every time.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCost-Effective Solution:\u003c\/strong\u003e Avoid expensive RV shop labor costs by installing this professional-grade fitting yourself - straightforward installation with basic tools.\u003c\/p\u003e\u003ch2\u003eInstallation Tips\u003c\/h2\u003e\u003cp\u003eFor best results, use this barbed hub coupler with the \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/1-1-2-uniseal-grommet-black-u150\"\u003e1.5\" Uniseal Grommet (U150)\u003c\/a\u003e to create watertight tank penetrations. The Uniseal grommet provides a flexible, leak-proof seal that accommodates slight misalignment and tank wall movement. Clean all surfaces thoroughly before installation, and ensure the barbed end is fully inserted into your hose or tubing for maximum grip. The hub end should be inserted through the Uniseal grommet that's already installed in your tank wall.\u003c\/p\u003e\u003ch2\u003eComplete Your RV Tank Setup\u003c\/h2\u003e\u003cp\u003eThis barbed hub coupler works perfectly with our \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/1-1-2-uniseal-grommet-black-u150\"\u003e1.5\" Black Uniseal Grommet (U150)\u003c\/a\u003e or \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/1-1-2-uniseal-grommet-white-u150-w\"\u003e1.5\" White Uniseal Grommet (U150-W)\u003c\/a\u003e for complete tank fitting installations. For larger tank connections, consider our \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/3-barb-x-hub-coupler-black-u300bc\"\u003e3\" Barbed Coupler for RV Holding Tanks\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eCompare RV Tank Barbed Couplers\u003c\/h2\u003e\u003cdiv style=\"overflow-x: auto; margin: 20px 0;\"\u003e\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e5e7eb;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background-color: #dc2626; color: white;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eSize\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eCompatible Grommet\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left; border: 1px solid #e5e7eb;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #fef2f2; border-left: 3px solid #dc2626;\"\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: bold;\"\u003eU150BC (This Product)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e1.5\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eU150 \/ U150-W\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eFresh water tanks, standard holding tanks, vent lines\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eCurrent Product\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb; font-weight: bold;\"\u003eU300BC\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e3\"\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eU300 Series\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003eLarge holding tanks, high-flow applications, main drain lines\u003c\/td\u003e\n\u003ctd style=\"padding: 12px; border: 1px solid #e5e7eb;\"\u003e\u003ca href=\"https:\/\/elkhartrvparts.com\/products\/3-barb-x-hub-coupler-black-u300bc\" style=\"color: #dc2626; text-decoration: none; font-weight: bold;\"\u003eView Details →\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp style=\"background-color: #f3f4f6; padding: 15px; border-left: 4px solid #dc2626; margin: 20px 0;\"\u003e\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Choose your coupler size based on your tank's existing fittings and flow requirements. The 1.5\" size is ideal for most standard RV fresh water and holding tank applications, while the 3\" size is better suited for large capacity tanks and main waste drain lines.\u003c\/p\u003e\u003ch2\u003eCustomer Reviews Highlight\u003c\/h2\u003e\u003cp\u003eRV owners consistently praise this fitting for its quality construction, perfect fit with Uniseal grommets, and leak-free performance. Customers appreciate that it's a hard-to-find part that's not available at local hardware stores, and they value the authentic OEM quality for critical RV plumbing repairs.\u003c\/p\u003e\u003ch2\u003eWhat's Included\u003c\/h2\u003e\u003cul\u003e\u003cli\u003eOne (1) Elkhart Plastics 1.5\" Barbed Hub Coupler - Black (Model U150BC)\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eNote: Uniseal grommet sold separately. We recommend purchasing the \u003ca href=\"https:\/\/elkhartrvparts.com\/products\/1-1-2-uniseal-grommet-black-u150\"\u003e1.5\" Uniseal Grommet U150\u003c\/a\u003e for complete installation.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What size Uniseal grommet do I need with this coupler?\u003c\/strong\u003e\u003cbr\u003eA: This U150BC coupler is designed to work with the 1.5\" Uniseal Grommet, model U150 (available in black or white).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I use this fitting without a Uniseal grommet?\u003c\/strong\u003e\u003cbr\u003eA: While the barbed end can connect to hoses independently, the hub end is specifically designed to work with Uniseal grommets for tank wall penetrations. For best results and leak-free performance, use with the appropriate Uniseal grommet.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is this suitable for potable water applications?\u003c\/strong\u003e\u003cbr\u003eA: Yes, this fitting is made from materials suitable for fresh water tank applications in RVs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Will this fit my RV's holding tank?\u003c\/strong\u003e\u003cbr\u003eA: If your tank currently uses 1.5\" fittings or you're installing new 1.5\" penetrations with U150 Uniseal grommets, this coupler will fit perfectly. For questions about compatibility with your specific RV model, use our AI Live Chat for assistance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What's the difference between this and a regular hardware store fitting?\u003c\/strong\u003e\u003cbr\u003eA: This is an OEM-grade RV-specific fitting designed to work with Uniseal grommets. Hardware store fittings typically aren't sized correctly for RV tank applications and don't provide the same leak-free performance.\u003c\/p\u003e\u003ch2\u003eOrder with Confidence\u003c\/h2\u003e\u003cp\u003eAs an authorized dealer of Elkhart Plastics\/Ameri-Kart products, we guarantee you're receiving 100% authentic OEM-grade parts. Every fitting is quality-checked before shipping to ensure you receive the exact part you need for your RV plumbing project.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNeed help with installation or compatibility questions?\u003c\/strong\u003e Use our AI Live Chat for expert assistance with product selection, installation guidance, and technical support.\u003c\/p\u003e\u003cp style=\"text-align: center; margin-top: 30px; padding: 20px; background-color: #f3f4f6; border: 2px solid #dc2626;\"\u003e\u003cstrong style=\"font-size: 18px; color: #dc2626;\"\u003eReady to Fix Your RV Tank Fitting?\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size: 14px;\"\u003eOrder now for fast shipping and get your RV plumbing system back in perfect working order!\u003c\/span\u003e\u003c\/p\u003e","brand":"Elkhart Plastics\/Ameri-Kart","offers":[{"title":"Default Title","offer_id":42237075914904,"sku":"190B","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/elkhart-plastics-1-5-barbed-hub-coupler-black-u150bc-rv-tank-fitting-shopify-1.jpg?v=1779182523"}],"url":"https:\/\/elkhartrvparts.com\/collections\/rv-tank-fittings.oembed?page=4","provider":"Elkhart RV Parts","version":"1.0","type":"link"}