Oatey 43904 PVC Backwater Valve, 4-Inch The product is manufactured in china 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 Threaded cap