Spears P105 Series PVC DWV Pipe Fitting, Cleanout Adapter, 4" Spigot x 4" NPT Female Cleanout adapter for connecting a cleanout plug to a fitting Spigot on one end and female NPT threads on the other 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)