Additional InformationASSE 1050/1051|ASTM D 2665/D 2661|IAPMO Approved|ICC ESR-1664|IPC 2003|IRC 2003|NSF 14|UPC Certified
Marketing InformationThe Oatey® Sure-Vent® 1-1/2 in 20 branch, 8 stack DFU air admittance valve with white tubular adapter is a 1-way valve designed to allow air into the plumbing drainage system when negative pressures develop in the piping system. Superior engineering along with stringent quality standards ensure unmatched performance as a secondary vent. Oatey® products have earned the trust of plumbing professionals for over 100 years.