This is a pressure-actuated regulator that is designed for any that fits within the flow and pressure range of the regulator.  The regulator determines the direction of the flow in the system and maintains system pressure via an adjustable nut that controls the amount of tension on a pressure spring.  When the water flow stops, it is diverted through the bypass port at virtually no pressure.  The regulator is capable of handling one or more shut-off guns and should be run with no bypass (if the full flow from the pump is going through the regulator).  It actuates at around 10% above the system pressure.

  • Giant Industries Limited Warranty
  • 22981R Literature


U.S. Metric
Flow (Maximum) 66 GPM 250 L/min
Pressure 2200 PSI 152 bar
Continuous Temperature 190 ºF 88 ºC
Inlet 1″ BSP
Outlet 1″ BSP
Bypass 3/4″ BSP
Weight 15.4 lbs 7.0 kg


Repair Kit – Part #09750
14 13247 Piston 1
15 13248 Seal Support 1
16 04036 Hexagon Nut 1
18 13012 O-Ring 1
20A 07281 O-Ring 1
21 07840 Support Ring 1
21A 13253 Support Ring 1
22 13254 Seal Pack 1
22A 13255 Seal Pack 1
23 13256 Valve Seat 1
25 12057 O-Ring 1
26 12055 O-Ring 1
28B 07653 O-Ring 1


Repair Kits Available

The repair kits listed to the right are available for this pump. If you need further information about these repair kits, or have questions about other specific parts for your pump, please contact you local Giant distributor or contact Giant customer service.

Service & Repair

Giant provides service on each pump and accessory that we sell. Many basic repair procedures are covered in the Giant repair manual. For all other questions on service or repair needs please contact your local Giant distributor.