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

Anodized 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 316 stainless steel manifold.

Gearbox and bell housings (to connect to gasoline, diesel, electric or hydraulic drive).

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
Flow10.7 GPM40.4 L/min
Maximum Discharge Pressure2500 PSI170 bar
Crankshaft Speed1450 RPM
Power18.5 HP13.8 KW
Max Temperature160 °F70 °C
Inlet Port Size(2) 1" BSP
Discharge Port Size(2) 3/4" BSP
Plunger Diameter0.98 in.25 mm
Stroke0.98 in.20 mm
Maximum Inlet Pressure145 PSI10 bar
Crankshaft Diameter1.1 in.28 mm
Crankshaft RotationTop of Pulley Towards Manifold
Key Width0.31 in.8 mm
Crankshaft MountingEither Side
Crankcase Oil Capacity30.4 fl. oz. 0.9 L
Weight36.6 lbs.16.6 kg
Volumetric Efficiency0.95
Mechanical Efficiency0.83
NPSHR0.83 Ft.-head

Horsepower Specifications

RPM GPM 1000 PSI 1500 PSI 2000 PSI 2500 PSI
750 5.5 3.8 5.7 7.5 9.5
900 6.6 4.6 6.8 9.0 11.4
1010 7.5 5.2 7.7 10.2 12.9
1120 8.3 5.7 8.6 11.4 14.3
1240 9.2 6.3 9.5 12.6 15.9
1450 10.7 7.4 11.1 14.7 18.5

Specification Images

Additional Drawings

  • P425-5111 Exploded View
  • P425-5111 Parts List
  • P425-5111 Torque Specifications


  • Giant Industries Limited Warranty
  • P425-5111 Installation Instructions
  • P425-5111 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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