Waterway 805-0224 Union / Tailpiece O-Ring (For 1-1/2" Waterway Unions)
The Waterway 805-0224 is a replacement union/tailpiece O-ring used to seal many Waterway 1-1/2" union-style connections.
It’s commonly found on Waterway gate valve unions and other threaded union/tailpiece fittings where a reliable, serviceable seal is
required. Replacing a flattened or cracked O-ring helps stop drips at the union and can prevent suction-side air leaks.
Key Details
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Manufacturer: Waterway
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Part Number: 805-0224
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Part Type: Union / tailpiece O-ring (threaded fitting seal)
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Typical Use: 1-1/2" Waterway union and gate valve union connections
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Color: Black
Common O-Ring Size
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Inside Diameter (ID): 1-3/4"
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Cross Section (Thickness): 1/8"
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Approx. Outside Diameter (OD): ~2"
Common Applications
- Waterway No-Flo 1-1/2" gate valve union seals
- Select Waterway heater tailpiece and union connections (1-1/2")
- Some Waterway filter assemblies that use this O-ring on threaded caps/couplings (model-dependent)
Best practice: confirm fit by matching the part number from your equipment parts list or measuring your existing O-ring before ordering.
What This O-Ring Does
- Seals the union faces to prevent water leaks under pressure.
- Helps prevent air intrusion on suction-side unions that can cause bubbles, noise, or priming issues.
- Maintains an easy-to-service union connection without cutting plumbing.
When to Replace
- Dripping or weeping at a union connection
- Flattened, cracked, swollen, or nicked rubber
- Union must be overtightened to stop a leak
- Union was opened for service and the old seal no longer reseals reliably
Installation Notes
- Turn the pump off and relieve system pressure before opening the union.
- Remove the old O-ring and clean the groove and mating faces (remove grit, scale, and residue).
- Seat the new O-ring evenly—do not twist it.
- Lightly lubricate with pool-safe silicone lubricant (avoid petroleum-based products).
- Hand-tighten the union nut snugly; overtightening can distort the seal and cause leaks.
- Restart the system and recheck for seepage once the system is running.
Maintenance Tip
If a union still seeps after replacing the O-ring, inspect the union nut and tailpiece for hairline cracks and confirm the plumbing
is not putting stress on the union faces. Misalignment can prevent a new seal from seating correctly.
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