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Item - Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline Silent, Body Material - Valves PVC, Pipe or Tube Size 1 1/2 in, Connection Type Slip x Slip, Cracking Pressure 0.5 psi, Mounting Orientation Horizontal, Vertical, Seal Material Buna-N, Max. Temp. - Valves 120 Degrees F, Min. Temp. - Valves 35 Degrees F, Max. Water Pressure - Valves 150 psi @ 72 Degrees F, Max. Steam Pressure - Valves Not Rated, Seat Material PVC, Spring Material 316 Stainless Steel