{"product_id":"711-4050-waterway-heater-union-gasket-o-ring-1-1-2","title":"711-4050 | Waterway Heater Union Gasket O-Ring | 1 1\/2\"","description":"\u003cp data-start=\"2186\" data-end=\"2849\"\u003eThe OEM Waterway 711-4050 1½″ Heater Union Gasket O-Ring provides a reliable sealing solution for pool and spa heater unions with 1½″ connections. Fabricated from quality rubber material with an integrated ribbed O-ring edge, it matches typical dimensions of 1-5\/8″ inside diameter and approx. 2-3\/8″ outside diameter unions. This part replaces legacy numbers such as 711-4050B, 9175-41 and 90-423-1002, and is designed to work with a wide range of union fittings in heater and pump plumbing systems. By fitting this gasket properly during service, you maintain optimal system integrity, minimize leak risk, and prolong the operational lifespan of the union joint.\u003c\/p\u003e\n\u003ch3 data-start=\"2851\" data-end=\"2867\"\u003eHighlights\u003c\/h3\u003e\n\u003cul data-start=\"2868\" data-end=\"3967\"\u003e\n\u003cli data-start=\"2868\" data-end=\"3053\"\u003e\n\u003cp data-start=\"2870\" data-end=\"3053\"\u003e\u003cstrong data-start=\"2870\" data-end=\"2898\"\u003eExact Union Replacement:\u003c\/strong\u003e Fits 1½″ unions (roughly 1-5\/8″ ID and 2-3\/8″ OD) to ensure correct contact and compression for effective sealing. \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:\/\/www.spaparts.com\/en_us\/o-ring-711-4050?utm_source=chatgpt.com\" rel=\"noopener\" alt=\"https:\/\/www.spaparts.com\/en_us\/o-ring-711-4050?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\"\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=\"2868\" data-end=\"3053\"\u003e\n\u003cp data-start=\"2870\" data-end=\"3053\"\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:\/\/www.spaparts.com\/en_us\/o-ring-711-4050?utm_source=chatgpt.com\" rel=\"noopener\" alt=\"https:\/\/www.spaparts.com\/en_us\/o-ring-711-4050?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\"\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=\"3056\" data-end=\"3082\"\u003eDurable Rubber Design:\u003c\/strong\u003e Crafted from resilient rubber with a ribbed O-ring configuration to adapt to union surfaces and handle thermal and pressure cycles typical in pool\/spa heater systems. \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=\"3290\" data-end=\"3524\"\u003e\n\u003cp data-start=\"3292\" data-end=\"3524\"\u003e\u003cstrong data-start=\"3292\" data-end=\"3316\"\u003eBroad Compatibility:\u003c\/strong\u003e Suitable for unions across multiple spa and pool heater brands, replacing Waterway 711-4050, 711-4050B, and other cross-reference numbers like 9175-41 and 90-423-1002. \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:\/\/lesliespool.com\/o-ring-gasket-1-1-2in.-union-2-5-16in.-od-1-7-16in.-id\/610873.html?srsltid=AfmBOopWkqfsJpQE3duHI3Q1RQEUU1_E5s38zVoeAqh6pmf_ytjtqZcg\u0026amp;utm_source=chatgpt.com\" rel=\"noopener\" alt=\"https:\/\/lesliespool.com\/o-ring-gasket-1-1-2in.-union-2-5-16in.-od-1-7-16in.-id\/610873.html?srsltid=AfmBOopWkqfsJpQE3duHI3Q1RQEUU1_E5s38zVoeAqh6pmf_ytjtqZcg\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=\"3290\" data-end=\"3524\"\u003e\n\u003cp data-start=\"3292\" data-end=\"3524\"\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:\/\/lesliespool.com\/o-ring-gasket-1-1-2in.-union-2-5-16in.-od-1-7-16in.-id\/610873.html?srsltid=AfmBOopWkqfsJpQE3duHI3Q1RQEUU1_E5s38zVoeAqh6pmf_ytjtqZcg\u0026amp;utm_source=chatgpt.com\" rel=\"noopener\" alt=\"https:\/\/lesliespool.com\/o-ring-gasket-1-1-2in.-union-2-5-16in.-od-1-7-16in.-id\/610873.html?srsltid=AfmBOopWkqfsJpQE3duHI3Q1RQEUU1_E5s38zVoeAqh6pmf_ytjtqZcg\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=\"3527\" data-end=\"3552\"\u003ePrevents Union Leaks:\u003c\/strong\u003e Targets common failure point where older or worn gaskets allow flow or weeping; installation restores tight seal at the union tailpiece. \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=\"3732\" data-end=\"3967\"\u003e\n\u003cp data-start=\"3734\" data-end=\"3967\"\u003e\u003cstrong data-start=\"3734\" data-end=\"3759\"\u003eEasy Service Upgrade:\u003c\/strong\u003e Remove the union nut, clean mating surfaces, check the seat for corrosion or wear, and install this gasket to reinstate proper sealing during routine plumbing service.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"662\" data-end=\"683\"\u003eAdditional Info\u003c\/h3\u003e\n\u003cp data-start=\"684\" data-end=\"1012\"\u003eIf you’re replacing the OEM Waterway 711-4050 1½″ Heater Union Gasket O-Ring, this section helps you confirm fitment, identify compatible unions, and troubleshoot leak issues before buying in store. This gasket supports 1½″ heater and pump union connections and replaces older numbers such as 711-4050B, 9175-41 and 90-423-1002.\u003c\/p\u003e\n\u003ch2 data-start=\"1014\" data-end=\"1068\"\u003eIdentifying the Correct 1½″ Waterway Union Gasket\u003c\/h2\u003e\n\u003cp data-start=\"1069\" data-end=\"1294\"\u003eThis gasket is designed for unions with an inside diameter around 1-5\/8″ and an outside diameter near 2-3\/8″. Its ribbed O-ring profile matches Waterway heater and pump unions commonly used in residential pool\/spa plumbing.\u003c\/p\u003e\n\u003ch4 data-start=\"1295\" data-end=\"1367\"\u003eHow to check if my heater union uses the Waterway 711-4050 gasket\u003c\/h4\u003e\n\u003ch4 data-start=\"1368\" data-end=\"1447\"\u003eCan I bring my old union gasket into the store to match the correct size\u003c\/h4\u003e\n\u003ch4 data-start=\"1448\" data-end=\"1519\"\u003eDoes this gasket replace earlier Waterway numbers like 711-4050B\u003c\/h4\u003e\n\u003ch4 data-start=\"1520\" data-end=\"1587\"\u003eHow to measure my union ID and OD to verify a proper 1½″ fit\u003c\/h4\u003e\n\u003ch4 data-start=\"1588\" data-end=\"1663\"\u003eWhat signs indicate my existing union gasket has flattened or failed\u003c\/h4\u003e\n\u003ch2 data-start=\"1665\" data-end=\"1725\"\u003eInstalling the Gasket and Preventing Heater Union Leaks\u003c\/h2\u003e\n\u003cp data-start=\"1726\" data-end=\"1947\"\u003eA proper seal requires seating the ribbed edge evenly against the tailpiece, checking for debris, and tightening the union by hand before final snugging. Correct installation prevents weeping, dripping or suction leaks.\u003c\/p\u003e\n\u003ch4 data-start=\"1948\" data-end=\"2024\"\u003eHow to install the 711-4050 gasket so the ribbed edge seals correctly\u003c\/h4\u003e\n\u003ch4 data-start=\"2025\" data-end=\"2092\"\u003eWhy unions may still leak even after installing a new gasket\u003c\/h4\u003e\n\u003ch4 data-start=\"2093\" data-end=\"2169\"\u003eCan I buy a new union tailpiece in store if mine is cracked or warped\u003c\/h4\u003e\n\u003ch4 data-start=\"2170\" data-end=\"2242\"\u003eWhat to check if the heater union drips only when the pump starts\u003c\/h4\u003e\n\u003ch4 data-start=\"2243\" data-end=\"2310\"\u003eWhether lubrication helps seat this style of Waterway gasket\u003c\/h4\u003e\n\u003ch2 data-start=\"2312\" data-end=\"2356\"\u003eMaintaining Long-Term Union Performance\u003c\/h2\u003e\n\u003cp data-start=\"2357\" data-end=\"2558\"\u003eReplacing worn gaskets reduces heater wear, prevents scale stains and ensures steady system pressure. Fresh gaskets restore compression and keep fittings tight during temperature and pressure cycles.\u003c\/p\u003e\n\u003ch4 data-start=\"2559\" data-end=\"2643\"\u003eHow often should I replace union gaskets on above-ground or in-ground systems\u003c\/h4\u003e\n\u003ch4 data-start=\"2644\" data-end=\"2725\"\u003eCan I buy matching Waterway unions in store if my fittings no longer align\u003c\/h4\u003e\n\u003ch4 data-start=\"2726\" data-end=\"2794\"\u003eWhat causes heater unions to lose seal after seasonal startup\u003c\/h4\u003e\n\u003ch4 data-start=\"2795\" data-end=\"2871\"\u003eHow to test for small weeping leaks around a freshly installed gasket\u003c\/h4\u003e\n\u003ch4 data-start=\"2872\" data-end=\"2947\"\u003eWhen to replace the entire union assembly instead of only the gasket\u003c\/h4\u003e","brand":"Waterway","offers":[{"title":"Default Title","offer_id":50920685666592,"sku":"711-4050","price":2.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/3326\/9536\/files\/711-4050WaterwayHeaterUnionGasketO-Ring112DiscountPoolMart_2.jpg?v=1766079204","url":"https:\/\/discountpoolmart.com\/products\/711-4050-waterway-heater-union-gasket-o-ring-1-1-2","provider":"Discount Pool Mart","version":"1.0","type":"link"}