Hayward Hydrostatic Relief Valve, 1-1/2", White | SP1056 Ladder Parts Can be used for both

Can be used for both treatment and weekly maintenance

This is a complete kit containing the filter base

fits filters manufactured after 5-85 Pentair TR Series TR100C TR100C only

Phosphate Remover and Enzymes

while CX875XRE is Hayward's part number for the complete factory 4-cartridge pack — both are compatible with the Unicel C-7489

Hayward Hydrostatic Relief Valve, 1-1/2", White | SP1056 Ladder Parts Can be used for bothHayward Hydrostatic Relief Valve 1 1 2" SP1056 For 1 1 2 and 2 inch pipe size Features and Benefits: Helps prevent pool damage due to external hydrostatic pressure beneath the pool shell when pool is drained Valve should be replaced whenever the pool is drained White ABS, spring loaded, leakproof self cleaning o ring seal Noncorrosive and nonconductive