{"title":"CPI Spinweld Fittings","description":"All active CPI spinweld fittings and related grommet items.","products":[{"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-1-1-4-fpt-raised-spinweld-fitting-1-3-4-hole-size-54ll-500151","title":"CPI - 1-1\/4\" FPT Threaded Raised Spinweld Fitting - 1-3\/4\" Hole Size - Part # 54LL (500151)","description":"\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #1d9bf0;padding:16px;margin-bottom:12px;\"\u003e\u003cstrong style=\"color:#1d9bf0;\"\u003e✓ ElkhartRVParts.com - The Only Authorized Place for CPI (Custom Plastics)\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #10b981;padding:16px;margin-bottom:24px;\"\u003e\u003cstrong style=\"color:#10b981;\"\u003e✓ 100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eCPI 1-1\/4\" FPT Threaded Raised Spinweld Fitting (Part #54LL \/ 500151)\u003c\/strong\u003e is the go-to solution for creating a secure, leak-resistant threaded connection on RV fresh water and holding tanks. The raised profile gives you extra clearance for fittings and hose connections, making installation and maintenance significantly easier than flush-mount alternatives.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 1-1\/4\" FPT (Female Pipe Thread)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired Hole Size:\u003c\/strong\u003e 1-3\/4\" diameter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Style:\u003c\/strong\u003e Raised Spinweld\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection Type:\u003c\/strong\u003e Threaded (FPT)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e RV Fresh Water Tanks \u0026amp; Holding Tanks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Durable Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Custom Plastics (CPI)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Numbers:\u003c\/strong\u003e 54LL \/ 500151\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold:\u003c\/strong\u003e Individually (Each)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the CPI Part #54LL Raised Spinweld Fitting?\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eraised spinweld design\u003c\/strong\u003e of the Part #54LL sets it apart from standard flush fittings. The elevated boss gives you more thread engagement depth and easier access for wrenches and hose connections — critical when working in tight RV tank compartments. The spinweld installation method creates a permanent, vibration-resistant bond directly to your polyethylene tank wall.\u003c\/p\u003e\n\u003cp\u003eWith a perfect \u003cstrong\u003e5.0-star rating from 7 verified buyers\u003c\/strong\u003e, the CPI 54LL is a proven performer trusted by RV owners and repair shops alike. It's the same OEM-grade fitting used by RV manufacturers during original production.\u003c\/p\u003e\n\n\u003ch2\u003eCompare CPI Spinweld \u0026amp; Raised Tank Fittings\u003c\/h2\u003e\n\u003cp\u003eNot sure which CPI fitting is right for your application? Use this table to compare thread size, hole size, and fitting style across the CPI lineup.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background:#dc2626;color:#fff;\"\u003e\n\u003cth style=\"padding:10px;border:1px solid #e5e7eb;text-align:left;\"\u003ePart #\u003c\/th\u003e\n\u003cth style=\"padding:10px;border:1px solid #e5e7eb;text-align:left;\"\u003eThread \/ Size\u003c\/th\u003e\n\u003cth style=\"padding:10px;border:1px solid #e5e7eb;text-align:left;\"\u003eHole Size\u003c\/th\u003e\n\u003cth style=\"padding:10px;border:1px solid #e5e7eb;text-align:left;\"\u003eFitting Style\u003c\/th\u003e\n\u003cth style=\"padding:10px;border:1px solid #e5e7eb;text-align:left;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding:10px;border:1px solid #e5e7eb;text-align:left;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003cstrong\u003e#55 (500108)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e1-1\/4\" FPT\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e1-1\/2\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eFlat Spinweld\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eLow-profile flush mount applications\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/rv-tank-fittings1-1-4-fitting-2-hole-size\" style=\"color:#dc2626;\"\u003eView #55\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-left:3px solid #dc2626;background:#fef2f2;\"\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\n\u003cstrong\u003e#54LL (500151)\u003c\/strong\u003e (This Product)\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e1-1\/4\" FPT\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e1-3\/4\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eRaised Spinweld\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eRaised clearance, easier hose\/fitting access\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCurrent Page\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003cstrong\u003e#61 (500121)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e1-1\/4\" Spigot\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e1-1\/2\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eSpigot Spinweld\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eSlip-fit pipe connections (no threads)\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/rv-tank-fittings1-1-4-spig-spin-fitting-1-1-2-hole-size\" style=\"color:#dc2626;\"\u003eView #61\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003cstrong\u003e#65M (500502)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e2\" Raised\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e2-1\/2\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eRaised Fitting\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eLarger diameter raised connections\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/rv-tank-fittings2-raised-fitting-2-1-2-hole-size\" style=\"color:#dc2626;\"\u003eView #65M\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size:13px;color:#6b7280;margin-top:8px;\"\u003e\u003cem\u003eTip: Choose a raised fitting when you need extra clearance for hose connections or when working in tight tank compartments. Use a flush fitting when tank wall space is limited.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 54LL \/ 500151\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 1-1\/4\" FPT (Female Pipe Thread)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired Hole Size:\u003c\/strong\u003e 1-3\/4\" diameter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Style:\u003c\/strong\u003e Raised Spinweld\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Durable Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Tanks:\u003c\/strong\u003e RV Fresh Water Tanks, RV Holding Tanks (polyethylene)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Method:\u003c\/strong\u003e Spinweld (heat-spin bonded to tank wall)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Custom Plastics (CPI)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit:\u003c\/strong\u003e Sold individually (Each)\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\/4\" FPT Threaded Raised Spinweld Fitting — Part #54LL (500151)\u003c\/li\u003e\n\u003cli\u003e30-day return policy\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Models \u0026amp; Alternatives\u003c\/h2\u003e\n\u003cp\u003eLooking for a different size or style? Browse related CPI fittings: \u003ca href=\"\/en-ca\/products\/rv-tank-fittings1-1-4-fitting-2-hole-size\" style=\"color:#dc2626;\"\u003e1-1\/4\" FPT Flat Spinweld #55\u003c\/a\u003e, \u003ca href=\"\/en-ca\/products\/rv-tank-fittings1-1-4-spig-spin-fitting-1-1-2-hole-size\" style=\"color:#dc2626;\"\u003e1-1\/4\" Spigot Spinweld #61\u003c\/a\u003e, and \u003ca href=\"\/en-ca\/products\/rv-tank-fittings2-raised-fitting-2-1-2-hole-size\" style=\"color:#dc2626;\"\u003e2\" Raised Fitting #65M\u003c\/a\u003e. Browse our full \u003ca href=\"\/en-ca\/collections\/rv-tank-fittings\" style=\"color:#dc2626;\"\u003eRV Tank Fittings collection\u003c\/a\u003e for the complete CPI lineup.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat hole size do I need to install the Part #54LL spinweld fitting?\u003c\/h3\u003e\n\u003cp\u003eThe CPI Part #54LL requires a \u003cstrong\u003e1-3\/4\" diameter hole\u003c\/strong\u003e in your tank wall for proper installation.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the thread size on the 54LL fitting?\u003c\/h3\u003e\n\u003cp\u003eThe fitting has \u003cstrong\u003e1-1\/4\" FPT (Female Pipe Thread)\u003c\/strong\u003e, which accepts standard 1-1\/4\" MPT male pipe thread fittings and adapters.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the difference between a raised and flush spinweld fitting?\u003c\/h3\u003e\n\u003cp\u003eA \u003cstrong\u003eraised spinweld fitting\u003c\/strong\u003e like the #54LL has an elevated boss above the tank wall, providing extra clearance for hose connections and easier wrench access. A flush fitting sits flat against the tank surface, which is better when space is extremely limited.\u003c\/p\u003e\n\n\u003ch3\u003eIs this fitting compatible with both fresh water and holding tanks?\u003c\/h3\u003e\n\u003cp\u003eYes — the CPI Part #54LL is designed for use with both \u003cstrong\u003eRV fresh water tanks and holding tanks\u003c\/strong\u003e (grey and black water) made from polyethylene.\u003c\/p\u003e\n\n\u003ch3\u003eHow is a spinweld fitting installed?\u003c\/h3\u003e\n\u003cp\u003eSpinweld fittings are installed using a drill and spinweld tool that spins the fitting at high speed against the tank wall, generating friction heat that fuses the fitting permanently to the polyethylene tank. This creates a leak-resistant bond without adhesives or sealants.\u003c\/p\u003e\n\n\u003ch3\u003eWhere can I buy the CPI Part #54LL spinweld fitting?\u003c\/h3\u003e\n\u003cp\u003eElkhartRVParts.com is an authorized CPI dealer. Order directly here for guaranteed authentic OEM-grade parts with fast shipping.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Elkhart RV Parts?\u003c\/h2\u003e\n\u003cp\u003eAs an authorized CPI (Custom Plastics) dealer, every fitting you purchase from us is 100% genuine OEM-grade. We stock authentic parts, ship fast, and back every order with our 30-day return policy. Our team specializes in RV plumbing — we're here to make sure you get the right part the first time.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #dc2626;padding:16px;margin-top:24px;\"\u003e\n\u003cstrong style=\"color:#dc2626;\"\u003eReady to order?\u003c\/strong\u003e Add the CPI Part #54LL to your cart today for fast shipping. Have a question about fitment or compatibility? Use our \u003cstrong\u003eAI Live Chat\u003c\/strong\u003e for instant answers from our RV parts experts.\n\u003c\/div\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":32789642838075,"sku":"54LL\/500151","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-fpt-raised-spinweld-fitting-1-3-4-hole-size-54ll-500151-shopify-1.jpg?v=1779179090"},{"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-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-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 # 60M","description":"\u003cp\u003e3\" Flush Fitting (3-7\/8\" Hole Size)\u003c\/p\u003e\n\u003cp\u003ePart # 60M (500116)\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41646585708696,"sku":"60M","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-flush-fitting-3-7-8-hole-size-part-60m-shopify-1.jpg?v=1779178501"},{"product_id":"white-probe-patch-1-2-hole-size-part-50","title":"White Probe Patch 1\/2\" Hole Size Part # 50","description":"\u003cp\u003eWhite Probe Patch (1\/2\" Hole Size)\u003c\/p\u003e\n\u003cp\u003ePart # 50 (500117) \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41646604124312,"sku":"50","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/white-probe-patch-1-2-hole-size-part-50-shopify-1.jpg?v=1779181644"},{"product_id":"3-patch-2-1-2-hole-size-part-76","title":"3\" Patch 2-1\/2\" Hole Size Part  # 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 # 79LL","description":"\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationStrong_rpyvj\" data-mce-fragment=\"1\"\u003e3\/4\" FPT Flush Spinweld Fitting (1-3\/8\" Hole Size\")\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationStrong_rpyvj\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationStrong_rpyvj\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationStrong_rpyvj\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationStrong_rpyvj\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationStrong_rpyvj\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv data-mce-fragment=\"1\"\u003e\u003cspan class=\"Polaris-TextStyle--variationSubdued_1segu\" data-mce-fragment=\"1\"\u003ePart # 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":"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":"cpi-rv-tank-patch-drive-tool-4-1-2-patch-3-1-8-hole-size-ld69l","title":"CPI - RV Tank Patch Drive Tool - 4-1\/2\" Patch - 3-1\/8\" Hole Size - Part # LD69L","description":"\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #1d9bf0;padding:16px;margin-bottom:12px;\"\u003e\u003cstrong style=\"color:#1d9bf0;\"\u003e✓ ElkhartRVParts.com - The Only Authorized Place for CPI\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #10b981;padding:16px;margin-bottom:20px;\"\u003e\u003cstrong style=\"color:#10b981;\"\u003e✓ 100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eCPI LD69L Drive Tool\u003c\/strong\u003e is the purpose-built installation tool for driving CPI #69 and #69L spinweld patch fittings into RV fresh water and holding tanks. Without the correct drive tool, patch fittings can be damaged during installation — this tool ensures a clean, leak-free weld every time.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e LD69L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Patches:\u003c\/strong\u003e CPI Patch #69 \u0026amp; #69L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatch Diameter:\u003c\/strong\u003e 4-1\/2\" (4.5\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired Hole Size:\u003c\/strong\u003e 3-1\/8\" (3.125\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e CPI (Custom Plastics Inc.)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e RV fresh water tanks \u0026amp; holding tanks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRating:\u003c\/strong\u003e 4.9\/5 stars (8 verified reviews)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the CPI LD69L Drive Tool?\u003c\/h2\u003e\n\u003cp\u003eSpinweld patch fittings require precise rotational force to create a proper friction weld to the tank wall. The \u003cstrong\u003eCPI LD69L drive tool\u003c\/strong\u003e is engineered specifically for the 4-1\/2\" patch geometry — it seats perfectly and transfers torque evenly, preventing cracking or misalignment. Using a generic tool risks a failed weld and a leaking tank.\u003c\/p\u003e\n\u003cp\u003eThis is the same tool used by professional RV technicians and service centers. If you're repairing an RV tank with a CPI #69 or #69L patch, this drive tool is not optional — it's essential.\u003c\/p\u003e\n\n\u003ch2\u003eCompare RV Tank Patch Fittings\u003c\/h2\u003e\n\u003cp\u003eNot sure which patch or tool is right for your repair? Use this guide to match your hole size to the correct CPI patch fitting.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background:#dc2626;color:#fff;\"\u003e\n\u003cth style=\"padding:10px;border:1px solid #e5e7eb;text-align:left;\"\u003eModel \/ Part #\u003c\/th\u003e\n\u003cth style=\"padding:10px;border:1px solid #e5e7eb;text-align:left;\"\u003ePatch Diameter\u003c\/th\u003e\n\u003cth style=\"padding:10px;border:1px solid #e5e7eb;text-align:left;\"\u003eHole Size\u003c\/th\u003e\n\u003cth style=\"padding:10px;border:1px solid #e5e7eb;text-align:left;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding:10px;border:1px solid #e5e7eb;text-align:left;\"\u003eView Details\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"border-left:3px solid #dc2626;background:#fef2f2;\"\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eLD69L (Drive Tool)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e4-1\/2\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e3-1\/8\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eInstalling #69 \u0026amp; #69L patches\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;\"\u003ePart #76 (Patch)\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e3\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e2-1\/2\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eMedium hole repairs\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/3-patch-2-1-2-hole-size-part-76\"\u003eView\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003ePart #51AD (Patch)\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e1\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e7\/8\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eSmall hole spinweld repairs\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/rv-tank-fittings1-patch-7-8-hole-size\"\u003eView\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003ePart #50 (Patch)\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eWhite Probe\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e1\/2\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eProbe port repairs\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/white-probe-patch-1-2-hole-size-part-50\"\u003eView\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eCPI Patch #71B (Patch)\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e3.400\" OD\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e2.200\" Pilot\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003eLarger OD patch repairs\u003c\/td\u003e\n\u003ctd style=\"padding:10px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/cpi-patch-2-200-pilot-x-3-400-od-black\"\u003eView\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size:13px;color:#6b7280;margin-top:8px;\"\u003e\u003cem\u003eTip: Always match your drive tool to the exact patch part number. Using the wrong tool can crack the patch or create a weak weld.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e LD69L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatch Compatibility:\u003c\/strong\u003e CPI #69 \u0026amp; #69L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatch Diameter:\u003c\/strong\u003e 4-1\/2\" (4.500\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired Hole Size:\u003c\/strong\u003e 3-1\/8\" (3.125\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive Method:\u003c\/strong\u003e Drill-driven spinweld installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Engineered for CPI spinweld patch geometry\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 5 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e CPI \/ Custom Plastics Inc.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e LD69L\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x CPI LD69L Drive Tool\u003c\/li\u003e\n\u003cli\u003e\u003cem\u003eNote: Patch fitting (#69 or #69L) sold separately\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Models \u0026amp; Alternatives\u003c\/h2\u003e\n\u003cp\u003eThis drive tool is designed exclusively for CPI #69 and #69L patch fittings. Browse compatible patches and related RV tank repair products:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en-ca\/products\/3-patch-2-1-2-hole-size-part-76\"\u003e3\" Patch - 2-1\/2\" Hole Size - Part #76\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ca\/products\/rv-tank-fittings1-patch-7-8-hole-size\"\u003e1\" Spinweld Patch - Part #51AD\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ca\/products\/white-probe-patch-1-2-hole-size-part-50\"\u003eWhite Probe Patch - 1\/2\" Hole Size - Part #50\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en-ca\/collections\/rv-tank-fittings-1\"\u003eShop All RV Tank Fittings\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs the patch fitting included with the LD69L drive tool?\u003c\/strong\u003e\u003cbr\u003eNo — the LD69L is the drive tool only. The CPI #69 or #69L patch fitting must be purchased separately.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat hole size do I need to drill for the #69 patch?\u003c\/strong\u003e\u003cbr\u003eYou need a 3-1\/8\" (3.125\") hole in the tank wall to use the CPI #69 or #69L patch with this drive tool.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this drive tool with other CPI patches?\u003c\/strong\u003e\u003cbr\u003eNo — the LD69L is specifically engineered for the 4-1\/2\" patch geometry of the #69 and #69L. Using it with other patch sizes may result in a failed installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this compatible with both fresh water and holding tanks?\u003c\/strong\u003e\u003cbr\u003eYes — CPI spinweld patch fittings and their drive tools are designed for use on both RV fresh water tanks and holding tanks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I install a spinweld patch fitting?\u003c\/strong\u003e\u003cbr\u003eDrill the correct hole size, insert the patch fitting, then use the LD69L drive tool in a drill to spin-weld the fitting to the tank wall using friction heat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhere can I buy the CPI LD69L drive tool?\u003c\/strong\u003e\u003cbr\u003eThe CPI LD69L is available exclusively at ElkhartRVParts.com — the only authorized CPI dealer online.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Elkhart RV Parts?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAuthorized CPI dealer — 100% OEM authentic parts\u003c\/li\u003e\n\u003cli\u003e4.9\/5 star rating from verified RV technicians and owners\u003c\/li\u003e\n\u003cli\u003eExpert support via AI Live Chat — get help matching the right tool to your repair\u003c\/li\u003e\n\u003cli\u003eFast shipping on all RV tank repair tools and fittings\u003c\/li\u003e\n\u003cli\u003eTrusted by professional RV service centers nationwide\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #dc2626;padding:16px;margin-top:20px;\"\u003e\n\u003cstrong style=\"color:#dc2626;\"\u003eReady to complete your RV tank repair?\u003c\/strong\u003e\u003cbr\u003eAdd the CPI LD69L Drive Tool to your cart and use our AI Live Chat to confirm compatibility with your specific patch fitting and tank model.\n\u003c\/div\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":41658130399384,"sku":"LD69L","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/cpi-rv-tank-patch-drive-tool-4-1-2-patch-3-1-8-hole-size-ld69l-representative-placeholder.png?v=1779187746"},{"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":"cpi-rv-tank-grommet-fitting-1-5-inch-2-25-hole-part-91","title":"CPI - 1-1\/2\" RV Tank Grommet Fitting - 2-1\/4\" Hole - Part 91 (500123)","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 CPI Parts\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\u003eCPI 1-1\/2\" Flex Rubber Grommet Tank Fitting - Part 91\u003c\/h2\u003e\u003cp\u003eThis professional-grade 1-1\/2\" slip flex rubber grommet fitting is specifically engineered for RV fresh water tanks and holding tanks. Manufactured by CPI, a trusted leader in RV tank components, this grommet fitting (Part # 91 \/ 500123) provides a secure, leak-resistant connection for 2-1\/4\" hole installations.\u003c\/p\u003e\u003ch3\u003eWhy Choose This CPI RV Tank Grommet Fitting?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthentic CPI Quality:\u003c\/strong\u003e 100% genuine CPI part, not a generic substitute - ensures proper fit and long-lasting performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Rubber Construction:\u003c\/strong\u003e Premium rubber material flexes to accommodate tank movement and vibration during travel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeak-Resistant Design:\u003c\/strong\u003e Creates a watertight seal to prevent costly leaks in your RV's water system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Slip-fit design makes installation straightforward for DIY RV owners and professional technicians\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Application:\u003c\/strong\u003e Works with both fresh water and holding tanks for maximum utility\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFitting Size: 1-1\/2\" slip connection\u003c\/li\u003e\n\u003cli\u003eRequired Hole Size: 2-1\/4\" diameter\u003c\/li\u003e\n\u003cli\u003eMaterial: Flexible rubber compound\u003c\/li\u003e\n\u003cli\u003ePart Numbers: 91, 500123\u003c\/li\u003e\n\u003cli\u003eManufacturer: CPI\u003c\/li\u003e\n\u003cli\u003eApplication: RV fresh water tanks, RV holding tanks\u003c\/li\u003e\n\u003cli\u003eCountry of Origin: Canada\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCommon Applications \u0026amp; Compatibility\u003c\/h3\u003e\u003cp\u003eThis grommet fitting is ideal for:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eRV fresh water tank installations and repairs\u003c\/li\u003e\n\u003cli\u003eRV black water holding tank connections\u003c\/li\u003e\n\u003cli\u003eRV grey water holding tank fittings\u003c\/li\u003e\n\u003cli\u003eCamper and motorhome water system upgrades\u003c\/li\u003e\n\u003cli\u003eTravel trailer tank replacements\u003c\/li\u003e\n\u003cli\u003eFifth wheel plumbing repairs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eInstallation \u0026amp; Use\u003c\/h3\u003e\u003cp\u003eThe 1-1\/2\" flex rubber grommet fitting installs into a 2-1\/4\" hole drilled in your RV tank. The flexible rubber design compresses to create a secure, leak-proof seal while allowing for slight tank flexing during travel. Perfect for connecting drain lines, fill lines, or vent lines to your RV's water or waste tanks.\u003c\/p\u003e\u003cdiv style=\"background-color: #f3f4f6; border-left: 4px solid #dc2626; padding: 15px; margin: 20px 0;\"\u003e\n\u003cp style=\"margin: 0; color: #dc2626; font-weight: bold;\"\u003e⚠️ Professional Installation Recommended\u003c\/p\u003e\n\u003cp style=\"margin: 5px 0 0 0; color: #4b5563;\"\u003eWhile this is a DIY-friendly part, proper installation is critical for preventing leaks. If you're unsure about installation, consult with an RV technician.\u003c\/p\u003e\n\u003c\/div\u003e\u003ch3\u003eWhy Buy From Elkhart RV Parts?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e✓ Authorized CPI dealer - guaranteed authentic parts\u003c\/li\u003e\n\u003cli\u003e✓ Fast shipping from our Indiana warehouse\u003c\/li\u003e\n\u003cli\u003e✓ Expert RV parts knowledge and support\u003c\/li\u003e\n\u003cli\u003e✓ Competitive pricing on genuine OEM components\u003c\/li\u003e\n\u003cli\u003e✓ Same-day shipping on in-stock orders\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eNeed help identifying the right fitting?\u003c\/strong\u003e Use our AI Live Chat for instant product assistance and compatibility verification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOrder your authentic CPI 1-1\/2\" RV tank grommet fitting today and ensure a leak-free water system in your RV!\u003c\/strong\u003e\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":42431903400088,"sku":"91","price":9.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/cpi-rv-tank-grommet-fitting-1-5-inch-2-25-hole-part-91-shopify-1.jpg?v=1779180719"},{"product_id":"cpi-black-spinweld-patch-holding-tank-4-5-od-69lb","title":"CPI - Black Spinweld Patch for RV Plastic Holding Tanks - 3.75\" Pilot x 4.50\" OD - 3-3\/4\" Hole Size - Part # 69LB","description":"\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #1d9bf0;padding:16px;margin-bottom:12px;\"\u003e\u003cstrong style=\"color:#1d9bf0;\"\u003e✓ ElkhartRVParts.com - The Only Authorized Place for CPI\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #10b981;padding:16px;margin-bottom:24px;\"\u003e\u003cstrong style=\"color:#10b981;\"\u003e✓ 100% Verified Authentic OEM Grade Part\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cp\u003eWhen your RV plastic holding tank develops a hole, the CPI 69LB Black Spinweld Patch delivers a fast, reliable, OEM-grade repair. Engineered specifically for RV fresh water and holding tank applications, this 4-1\/2\" patch covers a 3-3\/4\" hole with a precision spinweld fit — no guesswork, no leaks.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 69LB (CPI \/ Elkhart Plastics)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot Diameter:\u003c\/strong\u003e 3.75\" (3-3\/4\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 4.50\" (4-1\/2\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Size Covered:\u003c\/strong\u003e 3-3\/4\"\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 OEM-grade plastic — compatible with standard RV holding tank materials\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Spinweld method for a secure, watertight seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e RV fresh water tanks, black water holding tanks, gray water tanks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the CPI 69LB Spinweld Patch?\u003c\/h2\u003e\n\u003cp\u003eNot all RV holding tank patch fittings are created equal. The CPI 69LB is a factory-spec part sourced directly from CPI (Elkhart Plastics) — the same manufacturer that supplies original equipment to major RV builders. When you need an RV holding tank patch fitting that installs correctly the first time, this is the part professionals reach for.\u003c\/p\u003e\n\u003cp\u003eThe spinweld installation method creates a permanent, vibration-resistant bond that outlasts adhesive patches. Whether you're a DIY RV owner or a certified technician, the 3.75\" pilot x 4.50\" OD dimensions make alignment simple and the repair airtight.\u003c\/p\u003e\n\n\u003ch2\u003eCompare RV Holding Tank Patch Fittings\u003c\/h2\u003e\n\u003cp\u003eNot sure which patch size fits your tank hole? Use this comparison to find the right CPI spinweld patch for your application.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-family:sans-serif;font-size:14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background:#dc2626;color:#fff;\"\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border:1px solid #e5e7eb;\"\u003eModel (Part #)\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border:1px solid #e5e7eb;\"\u003ePilot Diameter\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border:1px solid #e5e7eb;\"\u003eOuter Diameter\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border:1px solid #e5e7eb;\"\u003eHole Size\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;border:1px solid #e5e7eb;\"\u003eBest For\u003c\/th\u003e\n\u003cth style=\"padding:10px 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=\"border-left:3px solid #dc2626;background:#fef2f2;\"\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCPI 69LB\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e3.75\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e4.50\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e3-3\/4\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eLarge hole repair on holding tanks\u003c\/td\u003e\n\u003ctd style=\"padding:10px 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:10px 12px;border:1px solid #e5e7eb;\"\u003eCPI 71B\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e2.200\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e3.400\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e~2\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eMedium hole repair\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/cpi-patch-2-200-pilot-x-3-400-od-black\"\u003eView\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f9fafb;\"\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eCPI 51B\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e1.550\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e2.300\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e~1-1\/2\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eSmall-medium hole repair\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/cpi-patch-1-550-pilot-x-2-300-od-black\"\u003eView\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eCPI 51AB\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e1.00\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e2.00\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e1\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eSmall hole repair\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/rv-tank-fittings2-black-spin-patch-1-hole-size\"\u003eView\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f9fafb;\"\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eCPI 81\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e1.75\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e3.00\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e1-3\/4\"\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003eMedium hole repair\u003c\/td\u003e\n\u003ctd style=\"padding:10px 12px;border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/3-black-patch-1-3-4-hole-size-part-81\"\u003eView\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size:13px;color:#6b7280;margin-top:8px;\"\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e Measure the hole diameter in your tank before ordering. The pilot diameter should be slightly larger than the hole for a proper spinweld seal.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 69LB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot (Hole Size):\u003c\/strong\u003e 3.75\" (3-3\/4\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 4.50\" (4-1\/2\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.7 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Type:\u003c\/strong\u003e Spinweld\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Tanks:\u003c\/strong\u003e RV plastic holding tanks, fresh water tanks, gray water tanks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e CPI \/ Elkhart Plastics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x CPI 69LB Black Spinweld Patch\u003c\/li\u003e\n\u003cli\u003eManufacturer warranty applies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Models \u0026amp; Alternatives\u003c\/h2\u003e\n\u003cp\u003eLooking for a different size? Browse our full line of \u003ca href=\"\/en-ca\/collections\/rv-tank-fittings\"\u003eRV Tank Fittings\u003c\/a\u003e. For smaller holes, consider the \u003ca href=\"\/en-ca\/products\/rv-tank-fittings2-black-spin-patch-1-hole-size\"\u003eCPI 51AB (1\" hole)\u003c\/a\u003e or the \u003ca href=\"\/en-ca\/products\/3-black-patch-1-3-4-hole-size-part-81\"\u003eCPI 81 (1-3\/4\" hole)\u003c\/a\u003e. For medium repairs, the \u003ca href=\"\/en-ca\/products\/cpi-patch-2-200-pilot-x-3-400-od-black\"\u003eCPI 71B\u003c\/a\u003e is a popular choice.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I install a spinweld patch on my RV holding tank?\u003c\/strong\u003e\u003cbr\u003eA spinweld patch is installed using a drill and spinweld tool. The patch spins at high speed against the tank surface, generating friction heat that fuses the plastic for a permanent, watertight seal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the CPI 69LB compatible with black water holding tanks?\u003c\/strong\u003e\u003cbr\u003eYes. The 69LB is designed for use on RV plastic holding tanks including black water, gray water, and fresh water tanks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat hole size does the 69LB patch cover?\u003c\/strong\u003e\u003cbr\u003eThe 69LB covers a 3-3\/4\" (3.75\") hole. The outer diameter is 4.50\" for full coverage and a secure seal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this an OEM part?\u003c\/strong\u003e\u003cbr\u003eYes. CPI (Elkhart Plastics) is an original equipment manufacturer supplying RV builders directly. This is the same part used in factory production.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhere can I buy the CPI 69LB spinweld patch?\u003c\/strong\u003e\u003cbr\u003eElkhartRVParts.com is an authorized CPI dealer. Ordering here ensures you receive a genuine OEM-grade part with full manufacturer backing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this patch on a fresh water tank?\u003c\/strong\u003e\u003cbr\u003eYes. The 69LB spinweld patch is compatible with both fresh water and holding tank applications.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Elkhart RV Parts?\u003c\/h2\u003e\n\u003cp\u003eWe are an authorized CPI dealer with direct access to the full Elkhart Plastics catalog. Every part we sell is 100% authentic — no gray market, no counterfeits. We ship fast, stand behind every order, and our AI Live Chat is available to help you confirm fitment before you buy.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f3f4f6;border-left:4px solid #dc2626;padding:16px;margin-top:24px;\"\u003e\n\u003cstrong style=\"color:#dc2626;\"\u003eReady to repair your RV tank?\u003c\/strong\u003e Add the CPI 69LB to your cart now — or chat with us via AI Live Chat to confirm this is the right patch for your application.\n\u003c\/div\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":42500040196248,"sku":"69LB","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/cpi-black-spinweld-patch-holding-tank-4-5-od-69lb-shopify-1.jpg?v=1779180040"},{"product_id":"3-flush-fitting-3-7-8-hole-size-part-60b","title":"3\" Flush Fitting 3-7\/8\" Hole Size Part # 60B","description":"\u003cp\u003e3\" Flush Fitting - Black (3-7\/8\" Hole Size)\u003c\/p\u003e\n\u003cp\u003ePart # 60B\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":42705264345240,"sku":"60B","price":4.99,"currency_code":"USD","in_stock":true}]},{"product_id":"3-4-fpt-raised-spinweld-fitting-part-74","title":"3\/4\" FPT Raised Spinweld Fitting Part # 74","description":"\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e3\/4\" FPT Raised Spinweld Fitting\u003c\/p\u003e\n\u003cp\u003ePart # 74\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":42705264836760,"sku":"74","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/3-4-fpt-raised-spinweld-fitting-part-74-shopify-1.jpg?v=1779178035"},{"product_id":"3-4-fpt-raised-spinweld-fitting-part-74b","title":"3\/4\" FPT Raised Spinweld Fitting Part # 74B","description":"\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e3\/4\" FPT Raised Spinweld Fitting - Black\u003c\/p\u003e\n\u003cp\u003ePart # 74B\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":42705268932760,"sku":"74B","price":4.99,"currency_code":"USD","in_stock":true}]},{"product_id":"rubber-tank-grommet-2-slip-2-5-8","title":"Rubber Tank Grommet 2\" (Slip 2-5\/8\")","description":"\u003cul\u003e\n\u003cli\u003ePlumbing fittings for RV's are designed with you in mind. Designed to work in a vast array of plumbing applications\u003c\/li\u003e\n\u003cli\u003eMade with a thick amount of material for strength and durability\u003c\/li\u003e\n\u003cli\u003eComes ready for install\u003c\/li\u003e\n\u003cli\u003eConsider a high quality and durable holding tank or fresh water tank for your replacement needs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e2\" Rubber Grommet Fitting\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":46351101952152,"sku":"CPI92","price":5.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/rubber-tank-grommet-2-slip-2-5-8-shopify-1.jpg?v=1779181103"},{"product_id":"icon-spin-fitting-sensor-1-od-white","title":"CPI Sensor - 1\" OD with 8\/32 Threaded S\/S","description":"\u003cp\u003eSensor - 1\" OD with 8\/32 Threaded S\/S\u003c\/p\u003e\u003cp\u003eCategory: Sensor Fittings\u003c\/p\u003e\u003cp\u003eCPI Part Number: 350\u003c\/p\u003e\u003cp\u003eRV tank fitting from CPI for fresh water and holding tank applications.\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":46351102017688,"sku":"350","price":45.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/icon-spin-fitting-sensor-1-od-white-shopify-1.jpg?v=1779181087"},{"product_id":"icon-spin-fitting-garden-hose-cap-w-gasket75","title":"CPI 3\/4\" Cap w\/Gasket","description":"\u003cp\u003e3\/4\" Cap w\/Gasket\u003c\/p\u003e\u003cp\u003eCategory: Garden Hose Fittings\u003c\/p\u003e\u003cp\u003eCPI Part Number: 375C\u003c\/p\u003e\u003cp\u003eRV tank fitting from CPI for fresh water and holding tank applications.\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":46351105687704,"sku":"375C","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/icon-spin-fitting-garden-hose-cap-w-gasket75-shopify-1.jpg?v=1779181047"},{"product_id":"icon-spin-fitting-non-threaded-inlet-boss-138-od-x-113-id-white","title":"CPI Boss - 1-3\/8\" OD Barb","description":"\u003cp\u003eBoss - 1-3\/8\" OD Barb\u003c\/p\u003e\u003cp\u003eCategory: Boss Fittings\u003c\/p\u003e\u003cp\u003eCPI Part Number: 62A\u003c\/p\u003e\u003cp\u003eRV tank fitting from CPI for fresh water and holding tank applications.\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":46351105720472,"sku":"62A","price":19.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/icon-spin-fitting-non-threaded-inlet-boss-138-od-x-113-id-white-shopify-1.jpg?v=1779181071"},{"product_id":"icon-spin-fitting-non-threaded-inlet-boss-15-od-x-113-id-x-119-long-white","title":"CPI Boss - 1-1\/2\" OD x 1-1\/8 ID x 1-3\/16\" Long","description":"\u003cp\u003eBoss - 1-1\/2\" OD x 1-1\/8 ID x 1-3\/16\" Long\u003c\/p\u003e\u003cp\u003eCategory: Boss Fittings\u003c\/p\u003e\u003cp\u003eCPI Part Number: 72A\u003c\/p\u003e\u003cp\u003eRV tank fitting from CPI for fresh water and holding tank applications.\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":46351105753240,"sku":"72A","price":19.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/icon-spin-fitting-non-threaded-inlet-boss-15-od-x-113-id-x-119-long-white-shopify-1.jpg?v=1779181080"},{"product_id":"icon-fitting-water-filter-screen","title":"CPI 3\" Slip Fitting","description":"\u003cp\u003e3\" Slip Fitting\u003c\/p\u003e\u003cp\u003eCategory: Slip Fittings\u003c\/p\u003e\u003cp\u003eCPI Part Number: 67\u003c\/p\u003e\u003cp\u003eRV tank fitting from CPI for fresh water and holding tank applications.\u003c\/p\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":46351107260568,"sku":"67","price":19.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/icon-fitting-water-filter-screen-shopify-1.jpg?v=1779181033"},{"product_id":"cpi-3-8-fpt-flush-spinweld-fitting-82","title":"CPI - 3\/8\" FPT Flush Spinweld Fitting - Female Pipe Thread - Part #82","description":"\u003cp\u003e\u003cstrong\u003eThe 3\/8\" FPT flush spinweld fitting\u003c\/strong\u003e is the small but critical threaded connection used when an RV tank plumbing setup needs a clean flush-mount female port. CPI Part #82 gives you a 3\/8\" Female Pipe Thread connection in a flush spinweld style, making it a practical choice for tank builds, tank repairs, and replacement plumbing points where a threaded fitting is required.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eCPI 3\/8\" FPT flush spinweld fitting\u003c\/li\u003e\n  \u003cli\u003eFemale Pipe Thread (FPT) connection\u003c\/li\u003e\n  \u003cli\u003eFlush-mount fitting style for low-profile tank installations\u003c\/li\u003e\n  \u003cli\u003eSpinweld design for permanent installation into compatible plastic tanks\u003c\/li\u003e\n  \u003cli\u003ePart #82 \/ SKU 82\u003c\/li\u003e\n  \u003cli\u003eUseful for RV tank plumbing repairs, replacements, and custom builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose This CPI 3\/8\" FPT Flush Spinweld Fitting?\u003c\/h2\u003e\n\u003cp\u003eWhen you need a small threaded tank connection, using the right fitting matters. This CPI flush spinweld fitting gives you a 3\/8\" Female Pipe Thread connection without a bulky raised profile, which helps when space is tight or when you want a cleaner finished tank surface. It is also a better choice than improvising with the wrong size fitting and ending up with leaks, poor thread engagement, or an awkward plumbing layout.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n  \u003ch2\u003eCompare CPI Flush Spinweld Fittings\u003c\/h2\u003e\n  \u003cp\u003eNot sure which CPI tank fitting size is right for your project? Here is a quick comparison of nearby flush FPT options:\u003c\/p\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse; font-size:14px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"background:#dc2626; color:white;\"\u003e\n        \u003cth style=\"padding:10px; border:1px solid #e5e7eb; text-align:left;\"\u003eModel\u003c\/th\u003e\n        \u003cth style=\"padding:10px; border:1px solid #e5e7eb; text-align:left;\"\u003eThread Size\u003c\/th\u003e\n        \u003cth style=\"padding:10px; border:1px solid #e5e7eb; text-align:left;\"\u003eStyle\u003c\/th\u003e\n        \u003cth style=\"padding:10px; border:1px solid #e5e7eb; text-align:left;\"\u003eBest For\u003c\/th\u003e\n        \u003cth style=\"padding:10px; border:1px solid #e5e7eb; text-align:left;\"\u003eView Details\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-left:3px solid #dc2626; background:#fef2f2;\"\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003e\u003cstrong\u003eCPI Part #82\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003e3\/8\" FPT\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003eFlush spinweld\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003eSmall threaded RV tank plumbing connections\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;\"\u003eCPI Part #83-LL\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003e1\/2\" FPT\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003eFlush fitting\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003eStepping up to a slightly larger threaded port\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/rv-tank-fittings1-2-flush-fitting-1-1-8-hole-size\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003eCPI Part #79LL\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003e3\/4\" FPT\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003eFlush spinweld\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003eLarger line connections that still need a flush profile\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/3-4-flush-fitting-1-3-8-hole-size-part-79\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003eCPI Part #55M\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003e1-1\/4\" FPT\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003eFlush spinweld with membrane\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003eBigger threaded tank connections with added sealing help\u003c\/td\u003e\n        \u003ctd style=\"padding:10px; border:1px solid #e5e7eb;\"\u003e\u003ca href=\"\/en-ca\/products\/cpi-1-1-4-flush-fpt-spinweld-fitting-membrane-55m\"\u003eView Details\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n  \u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e Match the fitting to the thread size you actually need first, then choose flush vs. raised style based on your available clearance and tank layout.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e CPI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 82\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection Size:\u003c\/strong\u003e 3\/8\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e FPT (Female Pipe Thread)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitting Style:\u003c\/strong\u003e Flush spinweld fitting\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e RV tank plumbing connection point\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.1 lb\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eOne CPI 3\/8\" FPT flush spinweld fitting\u003c\/li\u003e\n  \u003cli\u003eNo additional hardware or installation tools included unless otherwise noted\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Models \u0026amp; Alternatives\u003c\/h2\u003e\n\u003cp\u003eIf you are comparing sizes or building out a larger tank plumbing setup, these related CPI fittings are good next options:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/en-ca\/products\/rv-tank-fittings1-2-flush-fitting-1-1-8-hole-size\"\u003eCPI 1\/2\" FPT Flush Fitting - Part #83-LL\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/en-ca\/products\/3-4-flush-fitting-1-3-8-hole-size-part-79\"\u003eCPI 3\/4\" FPT Flush Spinweld Fitting - Part #79LL\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/en-ca\/products\/cpi-1-1-4-flush-fpt-spinweld-fitting-membrane-55m\"\u003eCPI 1-1\/4\" Flush FPT Spinweld Fitting w\/Membrane - Part #55M\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat does FPT mean on this CPI fitting?\u003c\/h3\u003e\n\u003cp\u003eFPT stands for Female Pipe Thread. That means this fitting is designed to accept a matching male threaded plumbing connection.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is a flush spinweld fitting?\u003c\/h3\u003e\n\u003cp\u003eA flush spinweld fitting is designed to be spin-welded into a compatible plastic tank so the fitting sits in a low-profile, flush-style position instead of standing proud like a raised fitting.\u003c\/p\u003e\n\n\u003ch3\u003eIs this the same as CPI Part #82?\u003c\/h3\u003e\n\u003cp\u003eYes. This listing is for CPI Part #82, a 3\/8\" FPT flush spinweld fitting.\u003c\/p\u003e\n\n\u003ch3\u003eCan I use this if I need a larger threaded fitting?\u003c\/h3\u003e\n\u003cp\u003eNo. If your plumbing layout needs a larger thread size, you should move up to the correct fitting size instead of forcing reducers into the wrong base fitting.\u003c\/p\u003e\n\n\u003ch3\u003eDoes this fitting include installation tools?\u003c\/h3\u003e\n\u003cp\u003eNo. This product is the fitting itself only unless otherwise noted. Spinweld installation requires the proper tooling and a compatible tank material.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Elkhart RV Parts?\u003c\/h2\u003e\n\u003cp\u003eWe carry hard-to-find RV tank fittings and plumbing parts that are easy to misidentify when you are buying from generic listings. That makes it easier to get the right CPI part the first time instead of losing time on returns or rework.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f3f4f6; border-left:4px solid #dc2626; padding:16px; margin-top:16px;\"\u003e\n  \u003cstrong\u003eNeed help matching the right CPI tank fitting?\u003c\/strong\u003e\u003cbr\u003e\n  Use our AI Live Chat to compare thread size, fitting style, and related options before you order.\n\u003c\/div\u003e","brand":"CPI","offers":[{"title":"Default Title","offer_id":49003572887704,"sku":"82","price":4.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0346\/2397\/9579\/files\/cpi-3-8-fpt-flush-spinweld-fitting-82-shopify-1.jpg?v=1779179871"}],"url":"https:\/\/elkhartrvparts.com\/en-ca\/collections\/cpi-spinweld-fittings.oembed?page=2","provider":"Elkhart RV Parts","version":"1.0","type":"link"}