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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
Stroke0.79 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 Capacity US30.4 fl. oz. 0.9 L
Weight36.6 lbs.16.6 kg
Volumetric Efficiency0.95
Mechanical Efficiency0.83
NPSHR0.83 Ft.-head
Manifold Material Stainless Steel
Crankcase Material Aluminum
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 #09653-0011
21 07266-0001 O-Ring, Viton 3
23 12254-0010 V-Sleeve, Viton 3
23B 12255-0010 Weep Seal, Viton 3
24 08376 Pressure Ring 6
Valve Assembly Kit – Part #09655
27A 08408-0100 Valve Assembly, Complete 6
33 07214 O-Ring 6
Oil Seal Kit – Part #09641
19 05444 Oil Seal 3

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

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • P425-5111 Exploded View
  • P425-5111 Parts List
  • P425-5111 Torque Specifications


Documents open in new window/tab.

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