The Inverted Sewer Vent Check Valve is designed to allow for ventilation in the open position. If the water level rises abouve the elevation of the valve, our patented float design automatically seals off the vent pipe to prevent the inflow of water into out-fall sewer lines. After water levels recede, the float returns to its original position to allow venting to continue. A stainless steel insect screen prevents debris from entering the lines. Standard is cast from 356-T6 aluminum with powder coated finish. Also available in stainless steel. Sizes 1.5" - 8" . Carbon galvanized steel to 16".
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