UNION O-RING 2.5IN 2-PACK

The Hayward “Union O‑Ring 2.5 in 2‑Pack” is a simple but essential sealing component used wherever a 2.5‑inch union connection is made in a pool or spa system — typically between a pump, filter, valve or plumbing section. The O‑rings are circular elastomer gaskets that sit snugly in a groove inside the union fitting; when the union is tightened, the O‑ring is compressed to form a watertight, pressure‑tight seal between the two halves of the union. Because pool systems operate under pressure and are exposed to water, chemicals, and temperature variations, these O‑rings are made from durable, chemical‑resistant rubber (often EPDM or a similar compound) so that they resist degradation, maintain elasticity, and provide a long‑lasting seal. When O‑rings like these are fresh and properly installed, they prevent leaks, help maintain stable flow and pressure, and simplify routine maintenance — since union fittings with O‑rings can be disassembled and re‑sealed easily without glue or special tools.