{"title":"CPI Raised Fittings","description":"CPI raised spinweld fittings.","products":[{"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-fittings1-1-4-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-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":"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":"3-4-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-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":"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}]}],"url":"https:\/\/elkhartrvparts.com\/en-ca\/collections\/cpi-raised-fittings.oembed","provider":"Elkhart RV Parts","version":"1.0","type":"link"}