The Oatey® Sure-Vent® 1.5″ 160 Branch, 24 Stack DFU Air Admittance Valve with Mechanical Adapter is a one-way valve designed to allow air into the plumbing drainage system when negative pressures develop in the piping system.

Do I need an AAV vent?

In any dwelling, there must be at least one vent open to the atmosphere outside (per code). An external, passive vent relieves positive pressure in the lines. No building should exclusively use AAVs – significant problems will result.

How long does an air admittance valve last?

Air admittance valves are constructed to last you about 20 to 30 years. Therefore, if you’re replacing the valves quite often, there’s a deeper problem. Usually, these happen because of problems with the valve itself.