GF Piping Systems CPVC Pipe Fitting, Solid Flange, Schedule 80, Gray, 4" NPT Female Flange for joining pipes or connecting valves in a piping system Female NPT threads for connecting to male NPT threaded pipes CPVC for chemical and corrosion resistance, high strength, and better resistance to high temperatures and pressures than PVC Operating temperature range of 0 to 93 degrees C (32 to 200 degrees F) Meets ASTM D1784 and F441 standards for quality assurance, meets NSF standards 14 and 61 for potable water service, and has a Class 150 bolt pattern per ANSI standard B16.5