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Complies to ASSE Standard 1050 and 1051
For use as a secondary vent
One size approved to handle up to 4" vent pipe
Opens/closes as needed by building's plumbing system
? Rated 500 DFU?s for venting DWV 4? and smaller
Product Description Oatey 39223 500 Stack DFU Capacity Straight PVC Schedule 40 Adapter Air Admittance Valve, 3 in. – 4 in. 160 Branch, Black/White From the Manufacturer Oatey products can be found in residential and commercial applications and have achieved excellent brand name recognition with consumers. All products are backed with the highest quality technical and customer support programs in the industry