Hayward Check Valve, 4 in, Single, Inline Wafer, CPVC, Flange x Flange - WCV2400VH Nominal Size-30" X 1.25" They're used on standardized components

They're used on standardized components common to all types of toilets such as toilet seats

System Pressure Drop (bar)

Standards: MSS SP-70

KIT-HAC/EMABF HARDWARE (FOR PANELS)

Speakman 31-0596-PNT 1-1/4 X 22-1/4 LG GALV PIPE

Hayward Check Valve, 4 in, Single, Inline Wafer, CPVC, Flange x Flange - WCV2400VH Nominal Size-30" X 1.25" They're used on standardized componentsItem Check Valves: Check Valve; Flow Design: Single; Mechanism and Body Design: Inline Wafer; Body Material Valves: CPVC; 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: FPM; Max. Temp. Valves: 190 Degrees F; Min. Temp. Valves: 40 Degrees F; Max. Water Pressure Valves: 150 psi @ 70 Degrees F;