6" x 4" SDR35 Sewer and Drain Gasketed Reducing Straight Tee. PVC Pipe is designed for both above and below ground DWV (Drain, Waste, Vent) Applications. Also the pipe can be used for both commercial and residential plumbing construction. PVC and its fittings are glued together with special glue that's designed to create a seal that is leak proof and durable like the pipe. Because PVC is fairly rigid, this pipe is an excellent pipe choice for just about any application in the DWV category. This 6"x4" PVC SDR35 Gasketed Sanitary Tee is designed for underground connections in larger more industrial and commercial applications. The gasket fittings allow the pipe to bend a little and still hold pressure and water.