Factory 2" union O-ring for Aqua Ultraviolet UV sterilizers and filters. Restores a drip-tight seal to stop leaks and prevent air draw at union connections.
Genuine Aqua Ultraviolet 2" union seal
Resilient elastomer for long service life
Seats easily; compatible with silicone-safe lubricants
Quick, tool-light fix for weeping unions
Fits Aqua Ultraviolet Classic / SL / Ultima components that use 2" slip/socket unions
Not for 1.5" or other sizes—verify union size before ordering
Size: 2" union O-ring (nominal)
Material: Durable elastomer (black)
Use: External wet-location plumbing (O-ring sits in union groove)
(1) 2" union O-ring
Shut off pump and relieve pressure.
Separate the union; remove the old O-ring and clean groove and sealing faces.
Lightly coat the new O-ring with silicone-safe lubricant (no petroleum).
Seat evenly in the groove; hand-tighten the union, then snug—do not overtighten.
Pressurize and leak-test.