{"product_id":"711-4030-waterway-heater-union-gasket-o-ring-2","title":"711-4030 | Waterway Heater Union Gasket O-Ring | 2\"","description":"\u003cp data-start=\"98\" data-end=\"856\"\u003eThe Waterway 711-4030 is a precision-engineered ribbed gasket\/O-ring designed to ensure a watertight seal at 2″ heater union connections. Manufactured by Waterway Plastics, this part is compatible with standard 2″ and 2½″ heater unions and tailpieces, making it ideal for both pool and spa heater applications. With an inner diameter of approximately 2-1\/8″ and an outer diameter around 2-15\/16″, it fits snugly between union flanges to prevent leaks and maintain system integrity. Crafted from durable elastomeric material that stands up to high temperature, chemical exposure and repeated service cycles, it serves as a reliable replacement gasket when performing maintenance or heater replacements.\u003c\/p\u003e\n\u003ch3 data-start=\"858\" data-end=\"874\"\u003eHighlights\u003c\/h3\u003e\n\u003cul data-start=\"875\" data-end=\"1618\"\u003e\n\u003cli data-start=\"875\" data-end=\"1031\"\u003e\n\u003cp data-start=\"877\" data-end=\"1031\"\u003e\u003cstrong data-start=\"877\" data-end=\"907\"\u003ePrecise Fit for 2″ Unions:\u003c\/strong\u003e Engineered with a ~2-1\/8″ ID and ~2-15\/16″ OD to match 2″ heater union connections.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1032\" data-end=\"1197\"\u003e\n\u003cp data-start=\"1034\" data-end=\"1197\"\u003e\u003cstrong data-start=\"1034\" data-end=\"1060\"\u003eRibbed O-Ring Profile:\u003c\/strong\u003e Features a raised sealing rib for enhanced compression and tighter sealing under union pressure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1198\" data-end=\"1333\"\u003e\n\u003cp data-start=\"1200\" data-end=\"1333\"\u003e\u003cstrong data-start=\"1200\" data-end=\"1230\"\u003eHigh Durability Materials:\u003c\/strong\u003e Built to resist pool and spa chemicals, heat and plumbing pressure fluctuations to reduce leak risk.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1334\" data-end=\"1473\"\u003e\n\u003cp data-start=\"1336\" data-end=\"1473\"\u003e\u003cstrong data-start=\"1336\" data-end=\"1363\"\u003eOEM-Compatible Quality:\u003c\/strong\u003e Produced by Waterway to align with original equipment standards and ensure compatibility in heater systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1474\" data-end=\"1618\"\u003e\n\u003cp data-start=\"1476\" data-end=\"1618\"\u003e\u003cstrong data-start=\"1476\" data-end=\"1513\"\u003eMaintenance-Friendly Replacement:\u003c\/strong\u003e A simple gasket swap when servicing tailpieces or heater unions helps prevent downtime and costly leaks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"503\" data-end=\"836\"\u003eIf you’re replacing the Waterway 711-4030 2″ Heater Union Gasket\/O-Ring, this guide explains how to confirm fitment, identify compatible heater unions and troubleshoot leak issues before buying in store. This ribbed gasket fits standard 2″ and 2½″ Waterway-style heater unions and supports dependable sealing in pool and spa systems.\u003c\/p\u003e\n\u003ch2 data-start=\"838\" data-end=\"897\"\u003eConfirming the Correct 2″ Waterway Heater Union Gasket\u003c\/h2\u003e\n\u003cp data-start=\"898\" data-end=\"1106\"\u003eThe 711-4030 is engineered with an inner diameter of about 2-1\/8″ and an outer diameter around 2-15\/16″. It fits snugly between heater union flanges and replaces worn gaskets that cause drips or weak seals.\u003c\/p\u003e\n\u003ch4 data-start=\"1107\" data-end=\"1179\"\u003eHow to check if my heater union uses the Waterway 711-4030 gasket\u003c\/h4\u003e\n\u003ch4 data-start=\"1180\" data-end=\"1256\"\u003eCan I bring my old gasket into the store to match the correct 2″ size\u003c\/h4\u003e\n\u003ch4 data-start=\"1257\" data-end=\"1322\"\u003eDoes this gasket fit 2″ and 2½″ Waterway heater tailpieces\u003c\/h4\u003e\n\u003ch4 data-start=\"1323\" data-end=\"1398\"\u003eHow to measure my union dimensions to confirm 711-4030 compatibility\u003c\/h4\u003e\n\u003ch4 data-start=\"1399\" data-end=\"1471\"\u003eWhat signs indicate my old heater gasket has flattened or cracked\u003c\/h4\u003e\n\u003ch2 data-start=\"1473\" data-end=\"1533\"\u003eInstalling the Gasket and Preventing Heater Union Leaks\u003c\/h2\u003e\n\u003cp data-start=\"1534\" data-end=\"1746\"\u003eCorrect installation requires aligning the ribbed sealing edge inside the union groove, tightening the nut evenly and ensuring the tailpiece surface is clean. This avoids pressure-cycle leaks and startup drips.\u003c\/p\u003e\n\u003ch4 data-start=\"1747\" data-end=\"1825\"\u003eHow to position the ribbed side of the 711-4030 gasket for best sealing\u003c\/h4\u003e\n\u003ch4 data-start=\"1826\" data-end=\"1898\"\u003eCan unions still leak even after installing a new Waterway gasket\u003c\/h4\u003e\n\u003ch4 data-start=\"1899\" data-end=\"1979\"\u003eCan I buy a replacement union nut or tailpiece in store if mine is warped\u003c\/h4\u003e\n\u003ch4 data-start=\"1980\" data-end=\"2048\"\u003eWhy some heater unions only leak when the pump first kicks on\u003c\/h4\u003e\n\u003ch4 data-start=\"2049\" data-end=\"2117\"\u003eWhether using lubricant helps seat the ribbed gasket properly\u003c\/h4\u003e\n\u003ch2 data-start=\"2119\" data-end=\"2163\"\u003eMaintaining Long-Term Union Performance\u003c\/h2\u003e\n\u003cp data-start=\"2164\" data-end=\"2359\"\u003eA fresh gasket restores compression, protects heater threads and prevents water loss during pressure changes. Regular inspection reduces failure risk and extends the life of the union assembly.\u003c\/p\u003e\n\u003ch4 data-start=\"2360\" data-end=\"2441\"\u003eHow often should I replace heater union gaskets in a typical backyard pool\u003c\/h4\u003e\n\u003ch4 data-start=\"2442\" data-end=\"2520\"\u003eCan I buy matching Waterway heater unions in store for worn connections\u003c\/h4\u003e\n\u003ch4 data-start=\"2521\" data-end=\"2597\"\u003eWhat causes 2″ union seals to fail after winter or seasonal shutdowns\u003c\/h4\u003e\n\u003ch4 data-start=\"2598\" data-end=\"2672\"\u003eHow to test for small weeping leaks around a newly installed gasket\u003c\/h4\u003e\n\u003ch4 data-start=\"2673\" data-end=\"2751\"\u003eWhen it’s better to replace the entire union instead of only the gasket\u003c\/h4\u003e","brand":"Waterway","offers":[{"title":"Default Title","offer_id":50920789311776,"sku":"711-4030","price":2.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/3326\/9536\/files\/711-4030WaterwayHeaterUnionGasketO-Ring2DiscountPoolMart_2.jpg?v=1766079195","url":"https:\/\/discountpoolmart.com\/products\/711-4030-waterway-heater-union-gasket-o-ring-2","provider":"Discount Pool Mart","version":"1.0","type":"link"}