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Protects low areas or basements from backflow or waste from street sewers.
Elastomeric seal in quick action flapper ensures a water tight seal.
Threaded access cap incorporates a neoprene seal for positive sealing and can be tightened or removed by hand.
Valve hub fits DWV pipe and can be adapted for sewer and drain pipe.
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Oatey Sure-Vent to the rescue!
-Al Berman - Dallas, Texas