Waterway 805-0145B 2 in Heater Tailpiece Union O-Ring
Waterway 805-0145B 2 in Heater Tailpiece Union O-Ring
A 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.
🚩 PRO TIP: 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.
PRODUCT FEATURES & SPECIFICATIONS:
- Brand: Waterway
- MPN: 805-0145B
- Type: Heater Tailpiece Union O-Ring
- Union Size: 2 in
- Application: Seals the tailpiece union connection on compatible Waterway heaters
- Compatibility: Waterway 2 in heater tailpiece unions
- Cross-Reference: 805-0145, APCO2455
FREQUENTLY ASKED QUESTIONS:
- What does the Waterway 805-0145B o-ring fit? 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.
- My heater union leaks only when the pump runs. Is it this o-ring? 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.
- Is APCO2455 the same part as the 805-0145B? Yes — APCO2455 is the APC cross-reference number for the Waterway 805-0145B 2 in heater tailpiece union o-ring.
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