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Everlfow’s Univent Air Admittance Valves (AAVs) are designed designed for use in residential and commercial drainage applications. The patented 360˚ AirFlow Design provides increased performance and reliability, allowing air into DWV systems, while preventing unpleasant odors and sewer gases from escaping into building. AAV's can be installed in a variety of locations, such as under sink, in attic or with louvered box, eliminating need for multiple roof penetrations. Approved to ANSI/ASSE 1050 & 1051, and available from 8 DFU-500 DFU.