Oatey 39018, 1-1/2 X 2, Black

• Complies to ASSE Standard 1050 and 1051

• For use as a secondary vent

• One size approved to handle up to 3" vent pipe

• Opens/closes as needed by building's plumbing system

• Rated 20 DFU?s for venting DWV 2? and smaller