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Oatey offers a wide range of Sure-Vent Air Admittance Valves (AAVs) to enable installation in virtually any application. These one-way valves are designed to allow air into the plumbing drainage system when negative pressures develop in the piping, eliminating the need to tie into a stack vent. Superior engineering along with stringent quality standards ensure unmatched performance. Oatey Sure-Vent AAVs comply with ASSE Standard 1050 and 1051 and IAPMO listed sizes, and are available in four sizes, ranging from 8 Stack/24 Branch DFU to 160 Stack/500 Branch DFU.