Oatey 39223 Air Admittance Valve

This Oatey PVC air admittance valve is sensitive to pressure changes and is able to consistently open and close. It features superior engineering and stringent quality standards to ensure a lifetime of unmatched performance. Use it as a secondary vent. This size is approved for an up to 4-in. vent pipe. The product is available in 6, 20, 160 and 500 DFU.