Hayward SP1056 Hydrostatic Relief Valve
The Hayward SP1056 Hydrostatic Relief Valve is designed to help prevent pool damage from external hydrostatic pressure beneath the pool shell when the pool is drained. Hydrostatic relief valves should be replaced every time the pool is drained. The SP1056 valve is made with white ABS material, is spring loaded with a leakproof self-cleaning o-ring seal and is noncorrosive and nonconductive. This valve fits 1-1/2 and 2 inch plumbing.
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