Oatey Plastic Air Admittance Valve 1-14-128-03 The transparent lid allows you

The transparent lid allows you to see what is inside without opening

Add a touch of colorful elegance to your patio

Can be installed with shelves up to 11 3/8 inch depth

The level has four units of measurement (degrees

Oatey Plastic Air Admittance Valve 1-14-128-03 The transparent lid allows youThe 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 1 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