Oatey 39016 Sure Vent Air Admittance Valve, 1.5" - 2" Plumbing It has a top swing

It has a top swing handle for easy carrying

DC47 turns on the spot

Finish: Oil rubbed bronze

Steel construction

Rugged filament withstands fan vibration

Oatey 39016 Sure Vent Air Admittance Valve, 1.5" - 2" Plumbing It has a top swingThe purpose of an Air Admittance Valve is to provide a method of allowing air to enter the plumbing drainage system without the use of a vent extended to open air and to prevent sewer gases from escaping into a building. An Air Admittance Valve is a one way valve designed to allow air to enter the plumbing drainage system when negative pressures develop in the piping system. The device shall close by gravity and seal the vent terminal at zero