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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
Flow3.5 GPM13.2 L/min
Maximum Discharge Pressure3685 PSI255 bar
Crankshaft Speed1750 RPM
Power8.9 HP6.6 KW
Max Temperature160 °F70 °C
Inlet Port Size(2) 1/2" BSP
Discharge Port Size(2) 3/8" BSP
Plunger Diameter0.71 in.18 mm
Stroke0.71 in.10.6 mm
Maximum Inlet Pressure145 PSI10 bar
Crankshaft Diameter24 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity14.2 fl. oz. 0.42 L
Extended Crankcase Oil Capacity17.0 fl. oz. 0.5 L
Crankcase Oil Capacity (Vertical) US17.0 fl. oz. 0.5 L
Weight16 lbs.7.3 kg

Horsepower Specifications

RPM GPM 1000 PSI 1500 PSI 2000 PSI 2500 PSI
500 0.13 0.1 0.1 0.2 0.2
1000 0.26 0.2 0.3 0.4 0.4
1750 0.46 0.3 0.5 0.6 0.8
3000 0.78 0.5 0.8 1.1 1.3
3200 0.83 0.5 0.9 1.1 1.4
3450 0.9 0.6 0.9 1.2 1.6

Specification Images

Additional Drawings

  • P323 Exploded View
  • P323 Parts List
  • P323 Torque Specifications


  • Giant Industries Limited Warranty
  • P323 Installation Instructions
  • P323 Repair Instructions
  • Troubleshooting Guide


Sample Pump

Our Company

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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