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. PVC plastic construction. Compatible with PVC pipes (not included). Can be used with a conversion gasket for cast-iron.