Commercial Swimming Pool Main Drain Accessories Select Model # SP1056 -- 1-1/2” Hydrostatic Valve (ABS) -- $15.96 4352 -- 1-1/2” Hydrostatic Valve (Bronze) -- $77.24 4353 -- 2” Hydrostatic Valve (Bronze) -- $81.26 SP1032 -- 12”X12” Grate Cover -- $213.67 Quantity: