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Hayward Check Valve, 4 in, Single, Inline Wafer, PVC, Flange x Flange - WCV1400E Portable Restrooms The design of the unitItem Check Valves: Check Valve; Flow Design: Single; Mechanism and Body Design: Inline Wafer; Body Material Valves: PVC; Pipe or Tube Size Check Valves: 4 in; Connection Type Check Valves: Flange x Flange; Cracking Pressure Check Valves: 1 psi; Mounting Orientation Check Valves: Horizontal, Vertical; Seal Material Check Valves: EPDM; Max. Temp. Valves: 140 Degrees F; Min. Temp. Valves: 40 Degrees F; Max. Water Pressure Valves: 150 psi @ 70 Degrees F;