The Studor Redi-Vent (Model 20353) is a compact air admittance valve designed to simplify drainage and waste venting without requiring expensive roof penetrations. This one-way valve automatically opens to admit fresh air when negative pressure occurs in the plumbing system and closes by gravity to block unpleasant sewer odors. It features a unique vermin protection system to keep out insects and debris. The unit includes a PVC adapter and is compatible with 1-1/2-inch and 2-inch piping, making it an ideal solution for venting single fixtures or groups up to 20 drainage fixture units (DFUs)

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