CMP 25830-400-000 - HydroSeal Spring Check ValveCMP 25830 400 000 HydroSeal Spring Check Valve is a serviceable black CPVC check valve built for one way flow in pool and spa plumbing where added corrosion resistance is important. Its 2 inch socket x 2. 5 inch spigot connection, 2 pound spring, and corrosion resistant internal components make it a strong choice for systems installed near chlorinators or brominators. Key Features: Corrosion resistant design 2 inch socket x 2. 5 inch spigot 2 pound