This is a pressure-actuated unloader that is designed for any pump that fits within the flow and pressure range of the unloader.  The unloader regulates the flow in the system and maintains system pressure via an adjustable knob that controls the amount of tension on a pressure spring.  When no flow is going out the outlet port, all flow is diverted to the bypass port at virtually no pressure.  This unloader design requires a partial bypass to operate.

WARNING: This product might contain a chemical known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

  • Giant Industries Limited Warranty
  • 22085 Literature


U.S. Metric
Maximum Flow 10.5 GPM 40 L/min
Maximum Pressure (Continuous) 5100 PSI 350 bar
Maximum Pressure (Intermittent) 5655 PSI 390 bar
Continuous Temperature 140 ºF 60 ºC
Intermittent Temperature 195 ºF 90 ºC
Inlet 3/8″ MBSP
Outlet 3/8″ FNPT
Bypass Port 1/2″ FBSP
Weight 1.8  lbs 0.82 kg


Full Repair Kit – Part #09183
2 08573 O-Ring 2
5 05457 O-Ring 1
7 05459 Seat 1
8 05460 Piston 1
9 08706 O-Ring 1
11 05462 Stem Seal 1
12 08719 O-Ring 1
16 05465 Piston Seal 1
18 08624 Ball S.S. 11/32″ 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.