Oatey Sure-Vent 3 in. x 4 in. PVC Air Admittance Valve with 500 DFU Branch

Oatey Sure-Vent Air Admittance Valves provide the ideal venting solution for island sinks, remote bathrooms and remodel jobs by eliminating the need for a stack vent. They are designed to block sewer gases in DWV systems by opening and closing when the slightest change in pressure is detected. Available with PVC or ABS adapters, this Sure-Vent air admittance valve vents up to 160 DFU (branch) or 500 DFU (stack) and fit 3 in.-4 in. pipes. Oatey products have earned the trust of plumbing professionals for over 100 years.