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ABS Cycolac Hydrostatic Relief Valve for Both 1-1/2 and 2 Inch Item: SP1056
$15.93 & FREE Shipping on orders over $35.

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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. For 1-1/2 and 2 inch pipe size.