Oatey 39016 Air Admittance Valve with Straight PVC Schedule 40 Adapter Sure- Vent 1.5 in x 2 in. 160 Branch, 24 Stack DFU Capacity, 1.5-2", White - Faucet Aerators And Adapters - Amazon.com
Studor Maxi-Vent Air Admittance Valve For Venting The Soil Stack and Avoiding Roof Penetration | Buy Air & Vacuum Valves & More at Southern Pipe & Supply
Oatey 39016 Air Admittance Valve with Straight PVC Schedule 40 Adapter Sure- Vent 1.5 in x 2 in. 160 Branch, 24 Stack DFU Capacity, 1.5-2", White - Faucet Aerators And Adapters - Amazon.com