{"product_id":"waterway-805-0145b-2-inch-heater-tailpiece-union-o-ring","title":"Waterway 805-0145B 2 in Heater Tailpiece Union O-Ring","description":"\u003cstrong\u003eWaterway 805-0145B 2 in Heater Tailpiece Union O-Ring\u003c\/strong\u003e\n\u003cp\u003eA heater union that drips every time the pump runs is usually not a cracked fitting — it is a flattened, hardened union o-ring that no longer seals. The Waterway 805-0145B is the replacement o-ring for the 2 in heater tailpiece union: it seats in the union groove and compresses between the tailpiece and the heater connection to stop the leak. This is a genuine Waterway part, and BayState notes the listing as a substitute item fulfilled to the same specification.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e🚩 PRO TIP:\u003c\/strong\u003e Coat the new 805-0145B o-ring with a thin film of silicone o-ring lubricant before assembly — never petroleum jelly, which degrades the rubber — and tighten the union nut hand-tight plus a quarter turn. Crushing the nut down with a wrench distorts the o-ring and causes the next leak.\u003c\/p\u003e\n\u003ch3\u003ePRODUCT FEATURES \u0026amp; SPECIFICATIONS:\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eBrand: Waterway\u003c\/li\u003e\n  \u003cli\u003eMPN: 805-0145B\u003c\/li\u003e\n  \u003cli\u003eType: Heater Tailpiece Union O-Ring\u003c\/li\u003e\n  \u003cli\u003eUnion Size: 2 in\u003c\/li\u003e\n  \u003cli\u003eApplication: Seals the tailpiece union connection on compatible Waterway heaters\u003c\/li\u003e\n  \u003cli\u003eCompatibility: Waterway 2 in heater tailpiece unions\u003c\/li\u003e\n  \u003cli\u003eCross-Reference: 805-0145, APCO2455\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFREQUENTLY ASKED QUESTIONS:\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWhat does the Waterway 805-0145B o-ring fit?\u003c\/strong\u003e The 805-0145B seals the 2 in tailpiece union used on compatible Waterway pool and spa heaters. Match your old o-ring's groove and union size before ordering — it is a 2 in union o-ring, not a pump lid o-ring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMy heater union leaks only when the pump runs. Is it this o-ring?\u003c\/strong\u003e Very likely. A union that drips under pressure but not at rest is the classic symptom of a flattened or cracked tailpiece union o-ring, and replacing the 805-0145B is the standard fix before replacing any fittings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIs APCO2455 the same part as the 805-0145B?\u003c\/strong\u003e Yes — APCO2455 is the APC cross-reference number for the Waterway 805-0145B 2 in heater tailpiece union o-ring.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWHY SHOP WITH AL'S COOL POOL STORE?:\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ Fast, reliable shipping on every order\u003c\/li\u003e\n  \u003cli\u003e✅ Genuine OEM and top-brand parts only\u003c\/li\u003e\n  \u003cli\u003e✅ Knowledgeable pool \u0026amp; spa experts ready to help\u003c\/li\u003e\n  \u003cli\u003e✅ Hassle-free returns and satisfaction guarantee\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Waterway Plastics","offers":[{"title":"Default Title","offer_id":45558850388103,"sku":"WW8050145B","price":3.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0634\/1217\/4983\/files\/waterway-805-0145b-heater-tailpiece-union-o-ring-complete.jpg?v=1793298245","url":"https:\/\/alscoolpoolstore.com\/products\/waterway-805-0145b-2-inch-heater-tailpiece-union-o-ring","provider":"Al's Cool Pool Store","version":"1.0","type":"link"}