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Complies to ASSE Standard 1050 and 1051. For use as a secondary vent. One size approved to handle up to 2" vent pipe. Opens/closes as needed by building's plumbing system. 6 DFU Capacity.<br><br>

Oatey 39228 Sure-Vent Air Admittance Valve 6 DFU Capacity with 1-1/2&quot; Schedule 40  PVC Adapter - Pkg Qty 6

oty-39228-sure-vent-air-admittance-valve-6-dfu-capacity-with-1-12-schedule-40-pvc-adapter

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