Spears 497 Series PVC Pipe Fitting, Union with EPDM O-Ring, Schedule 40, 2" Socket Union fitting for connecting and disconnecting two pipes more easily than with couplings Socket openings on both ends for connecting two male pipes PVC for strength and resistance to chemicals and corrosion, and an EPDM seal for resistance to oil, water, and some solvents Maximum operating temperature of 140 degrees F Meets ASTM D1784 and D2466 standards for quality assurance, and certified by NSF International for potable water service