{"product_id":"waterway-711-4050-heater-union-gasket-o-ring-1-1-2","title":"Waterway 711-4050 Heater Union Gasket O-Ring | 1 1\/2\"","description":"\u003cp data-start=\"123\" data-end=\"793\"\u003eOEM Waterway 711-4050 1½″ Heater Union Gasket O-Ring is engineered to restore a watertight seal in 1½″ union connections for heaters and pumps. Constructed of durable rubber with a ribbed O-ring extension, this gasket accommodates the typical 1-5\/8″ I.D. and ~2-3\/8″ O.D. dimensions found in standard 1½″ unions. It directly replaces part numbers such as 90-423-1002 and 9175-41 and is compatible with many hot tub and pool heater unions manufactured by Waterway and other brands. Installing this gasket helps prevent leaks at the union joint, maintains system integrity under pressure and thermal cycling, and supports hassle-free maintenance of the plumbing interface.\u003c\/p\u003e\n\u003ch3 data-start=\"795\" data-end=\"811\"\u003eHighlights\u003c\/h3\u003e\n\u003cul data-start=\"812\" data-end=\"1963\"\u003e\n\u003cli data-start=\"812\" data-end=\"995\"\u003e\n\u003cp data-start=\"814\" data-end=\"995\"\u003e\u003cstrong data-start=\"814\" data-end=\"834\"\u003ePrecise Fitment:\u003c\/strong\u003e Designed for 1½″ heater or pump union connections with approximately 1-5\/8″ inside diameter and 2-3\/8″ outside diameter. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"996\" data-end=\"1223\"\u003e\n\u003cp data-start=\"998\" data-end=\"1223\"\u003e\u003cstrong data-start=\"998\" data-end=\"1024\"\u003eMaterial Construction:\u003c\/strong\u003e Manufactured from resilient rubber with a ribbed O-ring extension to ensure consistent compression, sealing, and durability under pool\/spa service conditions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"996\" data-end=\"1223\"\u003e\n\u003cp data-start=\"998\" data-end=\"1223\"\u003e\u003cstrong data-start=\"1226\" data-end=\"1253\"\u003eCompatibility Covering:\u003c\/strong\u003e Suitable for unions on many spas, hot tubs and pool heaters that use 1½″ connections, and replaces Waterway part numbers 711-4050, 711-4050B, 90-423-1002 and 9175-41. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1461\" data-end=\"1687\"\u003e\n\u003cp data-start=\"1463\" data-end=\"1687\"\u003e\u003cstrong data-start=\"1463\" data-end=\"1492\"\u003eLeak Prevention Use-Case:\u003c\/strong\u003e Ideal for replacing worn or damaged gaskets at heater unions when you notice seepage or dripping at the union joint, supporting reliable system operation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003ca href=\"https:\/\/hottubwarehouse.com\/products\/waterway-15-union-gasket-711-4050?srsltid=AfmBOootdRW4gvy3CAemSIrMWQtW6nGUOaMGqAxt_moqkRSPXx9z8zte\u0026amp;utm_source=chatgpt.com\" rel=\"noopener\" alt=\"https:\/\/hottubwarehouse.com\/products\/waterway-15-union-gasket-711-4050?srsltid=AfmBOootdRW4gvy3CAemSIrMWQtW6nGUOaMGqAxt_moqkRSPXx9z8zte\u0026amp;utm_source=chatgpt.com\" class=\"flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium transition-colors duration-150 ease-in-out text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]!\" target=\"_blank\"\u003e\u003cspan class=\"relative start-0 bottom-0 flex h-full w-full items-center\"\u003e\u003cspan class=\"flex h-4 w-full items-center justify-between overflow-hidden\"\u003e\u003cspan class=\"max-w-[15ch] grow truncate overflow-hidden text-center\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1461\" data-end=\"1687\"\u003e\n\u003cp data-start=\"1463\" data-end=\"1687\"\u003e\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003ca href=\"https:\/\/hottubwarehouse.com\/products\/waterway-15-union-gasket-711-4050?srsltid=AfmBOootdRW4gvy3CAemSIrMWQtW6nGUOaMGqAxt_moqkRSPXx9z8zte\u0026amp;utm_source=chatgpt.com\" rel=\"noopener\" alt=\"https:\/\/hottubwarehouse.com\/products\/waterway-15-union-gasket-711-4050?srsltid=AfmBOootdRW4gvy3CAemSIrMWQtW6nGUOaMGqAxt_moqkRSPXx9z8zte\u0026amp;utm_source=chatgpt.com\" class=\"flex h-4.5 overflow-hidden rounded-xl px-2 text-[9px] font-medium transition-colors duration-150 ease-in-out text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]!\" target=\"_blank\"\u003e\u003cspan class=\"relative start-0 bottom-0 flex h-full w-full items-center\"\u003e\u003cspan class=\"flex h-4 w-full items-center justify-between overflow-hidden\"\u003e\u003cspan class=\"max-w-[15ch] grow truncate overflow-hidden text-center\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cstrong data-start=\"1690\" data-end=\"1725\"\u003eService \u0026amp; Maintenance Friendly:\u003c\/strong\u003e Simple to install when servicing or replacing a heater tailpiece or union nut—just remove the old seal, clean the mating surfaces, lubricate if required, and install the new Waterway 711-4050 gasket.\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"3076\" data-end=\"3097\"\u003eAdditional Info\u003c\/h3\u003e\n\u003cp data-start=\"3098\" data-end=\"3404\"\u003eThe OEM Waterway 711-4050 1½″ Heater Union Gasket O-Ring is a common replacement for service technicians and local customers who maintain Waterway-style heater and pump plumbing. This guide explains compatibility checks, leak troubleshooting and how to source the correct gasket with local pricing options.\u003c\/p\u003e\n\u003ch2 data-start=\"3406\" data-end=\"3468\"\u003eVerifying Compatibility With Local Heater and Pump Unions\u003c\/h2\u003e\n\u003cp data-start=\"3469\" data-end=\"3667\"\u003eThis gasket replaces Waterway part numbers 711-4050, 711-4050B, 9175-41 and 90-423-1002. Its ribbed O-ring profile fits many 1½″ unions used in heaters, pumps and after-market plumbing assemblies.\u003c\/p\u003e\n\u003ch4 data-start=\"3668\" data-end=\"3752\"\u003eHow to confirm the 711-4050 gasket matches the union used on my heater system\u003c\/h4\u003e\n\u003ch4 data-start=\"3753\" data-end=\"3829\"\u003eCan local shops provide multi-pack pricing for service-route stocking\u003c\/h4\u003e\n\u003ch4 data-start=\"3830\" data-end=\"3910\"\u003eWhether this gasket is compatible with non-Waterway heater unions near me\u003c\/h4\u003e\n\u003ch4 data-start=\"3911\" data-end=\"3980\"\u003eHow to verify fitment by checking union ID and OD measurements\u003c\/h4\u003e\n\u003ch4 data-start=\"3981\" data-end=\"4055\"\u003eWhether older Waterway unions still use the same ribbed-edge gasket\u003c\/h4\u003e\n\u003ch2 data-start=\"4057\" data-end=\"4101\"\u003eInstallation and Field-Service Handling\u003c\/h2\u003e\n\u003cp data-start=\"4102\" data-end=\"4319\"\u003eTechnicians typically install this gasket by aligning the ribbed lip toward the sealing surface and ensuring the tailpiece is clean before tightening. Proper seating prevents leaks during startup or pressure spikes.\u003c\/p\u003e\n\u003ch4 data-start=\"4320\" data-end=\"4401\"\u003eHow to position the ribbed side of the 711-4050 gasket during installation\u003c\/h4\u003e\n\u003ch4 data-start=\"4402\" data-end=\"4479\"\u003eWhy unions may leak intermittently after replacement on service routes\u003c\/h4\u003e\n\u003ch4 data-start=\"4480\" data-end=\"4559\"\u003eWhether warped or heat-damaged tailpieces require full union replacement\u003c\/h4\u003e\n\u003ch4 data-start=\"4560\" data-end=\"4638\"\u003eHow to detect if debris or scale buildup is preventing full compression\u003c\/h4\u003e\n\u003ch4 data-start=\"4639\" data-end=\"4718\"\u003eCan a technician use silicone lubricant to help the gasket seat properly\u003c\/h4\u003e\n\u003ch2 data-start=\"4720\" data-end=\"4778\"\u003eMaintaining Reliable Seals Across Local Water Systems\u003c\/h2\u003e\n\u003cp data-start=\"4779\" data-end=\"4962\"\u003eConsistent gasket replacement prevents heater deterioration and pump cavitation caused by minor air intrusion. Keeping unions sealed ensures stable flow and efficient heater output.\u003c\/p\u003e\n\u003ch4 data-start=\"4963\" data-end=\"5038\"\u003eHow often to replace 1½″ union gaskets on commercial or rental pools\u003c\/h4\u003e\n\u003ch4 data-start=\"5039\" data-end=\"5108\"\u003eHow local water hardness affects the lifespan of union gaskets\u003c\/h4\u003e\n\u003ch4 data-start=\"5109\" data-end=\"5172\"\u003eHow to diagnose flow drops caused by partial union leaks\u003c\/h4\u003e\n\u003ch4 data-start=\"5173\" data-end=\"5255\"\u003eWhat signs indicate it’s time to replace the entire union nut and tailpiece\u003c\/h4\u003e\n\u003ch4 data-start=\"5256\" data-end=\"5340\"\u003eWhere to check local price availability for Waterway 711-4050 gaskets near me\u003c\/h4\u003e","brand":"Waterway","offers":[{"title":"Default Title","offer_id":54498595897635,"sku":"711-4050","price":1.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0914\/0987\/5235\/files\/Waterway711-4050HeaterUnionGasketO-Ring112WholesalePoolMart_2.jpg?v=1766079106","url":"https:\/\/wholesalepoolmart.com\/products\/waterway-711-4050-heater-union-gasket-o-ring-1-1-2","provider":"Wholesale Pool Mart","version":"1.0","type":"link"}