GF Piping Systems PVC Pipe Fitting, Adapter, Schedule 80, Gray, 3" NPT Male x Socket Adapter for connecting pipes or fittings of different types Socket opening on one end and male NPT threads on the other for connecting two pipes with different ends PVC for chemical and corrosion resistance, high strength, and less weight than fittings made from metal Operating temperature range of 0 to 60 degrees C (32 to 140 degrees F) Meets ASTM D1784 and D1785 standards for quality assurance, and meets NSF standards 14 and 61 for potable water service