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An American-made triplex plunger positive displacement pump with reciprocating plungers for direct or belt drive applications.

Aluminum crankcase with sight glass and vented dipstick; forged, through-hardened, ground and polished crankshaft; bronze connecting rods; hardened stainless steel plunger bases; solid ceramic plungers; nitrile seals (with fabric reinforcing); stainless steel valves and forged brass manifold.

Gearbox and bell housings (to connect to gasoline, diesel, electric or hydraulic drive), couplers (aluminum or Delrin), unloader/regulator, fixed or adjustable chemical injector, thermal relief valve and pulsator valve.

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

Specification US Metric
Flow4 GPM15.1 L/min
Maximum Discharge Pressure3500 PSI240 bar
Crankshaft Speed1450 RPM
Power9.7 HP7.2 KW
Flow (High Speed)4.7 GPM17.8 L/min
Maximum Discharge Pressure (High Speed)3000 PSI200 bar
Power Consumption (High Speed)9.7 HP7.2 KW
Crankshaft Speed (High)1750 RPM
Max Temperature160 °F70 °C
Inlet Port Size(2) 1/2" BSP
Discharge Port Size(2) 3/8" BSP
Plunger Diameter0.71 in.18 mm
Stroke0.56 in.14.1 mm
Maximum Inlet Pressure145 PSI10 bar
Crankshaft Diameter24 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity US14.2 fl. oz. 0.42 L
Extended Crankcase Oil Capacity17.0 fl. oz. 0.5 L
Weight16 lbs.7.3 kg
Manifold Material Forged Brass
Crankcase Material Aluminum Die Cast
Plunger Material Solid Ceramic Oxide
Valve Material High Grade Stainless Steel
Seal Material Nitrile with Fabric Reinforcing
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.
Plunger Packing Kit – Part #09119
23 08477 Grooved Seal, Black 3
23A 08087 Grooved Seal, Brown 3
24 07904 Pressure Ring 6
Valve Assembly Kit – Part #09116
31 07853 O-Ring 6
32X 07946A Valve Assembly Complete 6
33 07913 O-Ring 6
Oil Seal Kit – Part #09144
19 08356 Oil Seal 3
Optional Viton Packing Kit – Part #09456
18 07770-0001 O-Ring, Viton 3
21 07780-0001 O-Ring, Viton 3
22 12027-0001 O-Ring, Viton 3
23/23A 07902-0010 V-Sleeve, Viton 6
24 07904 Pressure Ring 6
31 07853-0001 O-Ring, Viton 6
33 07913-0001 O-Ring, Viton 6
Optional High-Temp Seal Kit – Part # 09599
23/23A 08477-0030 High-Temp Seals 6
24 07904 Pressure Ring 6

Horsepower Specifications

RPM GPM 2000 PSI 2750 PSI 3000 PSI 3500 PSI
1025 2.9 4.0 5.5 6.0 7.0
1340 3.8 5.2 7.2 7.9 9.2
1450 4.0 5.5 7.6 8.3 9.7
1750 4.7 6.5 8.9 9.7 11.4

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • P322 Exploded View
  • P322 Parts List
  • P322 Torque Specifications


Documents open in new window/tab.

  • Pump Assembly Instructions
  • Giant Industries Limited Warranty
  • P322 Installation Instructions
  • P322 Repair Instructions
  • Troubleshooting Guide

Sample Pump

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For 50 years, Giant Pumps has offered the most dependable positive displacement high-pressure triplex pumps available. Designed and built to the highest quality standards, customers count on Giant Pumps products to keep their equipment running. Every design detail of Giant Pumps products is optimized for long-life and reliable performance, making Giant Pumps the most trusted name in high-pressure pumps and systems.

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