Spears P107 Series PVC DWV Pipe Fitting, Bushing, 6" Spigot x 4" Hub Bushing for connecting two pipes with different diameters Spigot on one end and hub connection on the other end for connecting two pipes with different ends PVC for corrosion resistance, high strength, and less weight than fittings made from metal Operating temperature range of 73 to 140 degrees F (23 to 60 degrees C) Complies with ASTM D2665 and ASTM D3311 and certified to NSF/ANSI International Standard 14 (NSF-dwv) and NSF International Uniform Plumbing Code (NSF-U.P. Code)