Starter 20341 Mini Vent with PVC Adapter 1 1/2" or 2" Connection

Studor 20341 Mini-Vent Air Admittance Valve with PVC Adapter, 1-1/2- or 2-Inch Connection

Studor 20380 Recessed Air Admittance Valve Box and Grill

Oatey Sure-Vent 1-1/2 in.–2 in. 160 Branch, 24 Stack DFU Air Admittance Valve with White PVC Sch. 40 Adapter