Spears 856P Series PVC Pipe Fitting, Van Stone Flange, Class 150, Schedule 80, Gray, 4" Spigot Van Stone flange for joining two pipes or connecting valves in a piping system Spigot connection for connecting to unthreaded pipes or fittings PVC for chemical and corrosion resistance, high strength, and less weight than fittings made from metal Maximum operating temperature of 140 degrees F Meets ASTM D1784 and D2467 standards for quality assurance, certified by NSF International for potable water service, and has a Class 150 bolt pattern per ANSI standard B16.5