39223 OATEY SURE-VENT 500DFU AIR ADMITTANCE VALVE PVC 3X4 WITH ADAPTER

The 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 Differential Pressure (No Flow Conditions) and Under Positive Internal Pressures

Rated 20 DFU's for Venting DWV 4 Inch and Smaller

Sweet Spot Technology Opens at -0.01 PSI and Seals at 0 PSI and above

Screening on Air Inlets to Guard the Seal

Protective Rubber Sleeve Provides Grip for Installation and Keeps Valve Free from Debris

Lead-Free

Lifetime Limited Warranty