Spears 851 Series PVC Pipe Fitting, One Piece Flange, Class 150, Schedule 80, 1" Socket Flange for joining pipes or connecting valves in a piping system Socket opening for connecting to a male pipe or fitting 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