Oatey 43788 Plumbing Pipes, 3 x 2-Inch, Black For tapping into a 3"" or 4"" Sch 40 DWV line Saddle is solvent welded to the existing line and secured with metal V-bolts, washers and nuts provided in the kit The tee accepts the incoming line inside the socket, or joins with a Sch 40 DWV fitting 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