- Delta Prep 4000
- Pump heads stamped with 4 or 5
- WAT033325 inlet check valve, INLET CHK VALVE 1/4" M590 (This is for pump heads stamped with a 4 or 5)
- WAT033326, outlet check valve part number, OUTLET CK VALVE 1/4" M590 (pump head stamped with 4,5, or 6)
- WAT037495 check valve rebuild kit. It contains parts to rebuild all four check valves, inlet and outlet.