Spears 479 Series PVC Pipe Fitting, Coupling, Schedule 40, 2-1/2" Socket Coupling for connecting two pipes with the same diameter in a straight run Socket ends for connecting to male pipes or fittings 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) Meets ASTM D2466 for quality assurance and NSF/ANSI Standard 61, Annex G for potable water