Spears 8059-SR Series PVC Pipe Fitting, Union with Viton O-Ring, Schedule 80, Gray, 1" Socket x Stainless Steel Reinforced NPT Female Union fitting for connecting and disconnecting two pipes more easily than with couplings Socket opening on one end and reinforced female NPT threads on the other for connecting two pipes PVC body with a stainless steel reinforcement for strength and resistance to chemicals and corrosion Maximum operating temperature of 140 degrees F Meets ASTM D1784 and D2467 standards for quality assurance, and certified by NSF International for potable water service