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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
Flow5.5 GPM21 L/min
Maximum Discharge Pressure2030 PSI140 bar
Crankshaft Speed750 RPM
Power7.8 HP5.8 KW
Max Temperature160 °F70 °C
Inlet Port Size(2) 1" BSP
Discharge Port Size(2) 3/4" BSP
Plunger Diameter1.02 in.25 mm
Stroke0.79 in.20 mm
Maximum Inlet Pressure870 PSI60 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
Weight38.3 lbs.17.4 kg
Manifold Material 316 Stainless Steel
Crankcase Material Aluminum
Plunger Material Solid Ceramic Oxide
Valve Material High Grade Stainless Steel
Seal Material Teflon and Nitrile with EPDM O-Rings
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 #CP09595
21 CP07266-0003 O-Ring 3
23 CP06144 V-Sleeve 3
23B CP12255-0020 Weep Seal 3
24 CP08376 Pressure Ring 6
Valve Assembly Kit – Part #CP09596-0103
27A CP04643-0103 Valve Assembly, Complete 6
33 CP07218-0003 O-Ring 6
Oil Seal Kit – Part #CP09641
19 CP05444 Oil Seal 3

Horsepower Specifications

RPM GPM 500 PSI 1000 PSI 1500 PSI 2030 PSI
350 2.59 0.9 1.8 2.7 3.6
450 3.33 1.1 2.3 3.4 4.7
550 4.07 1.4 2.8 4.2 5.7
650 4.81 1.7 3.3 5.0 6.7
750 5.55 1.9 3.8 5.7 7.8

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • CP425-5123 Exploded View
  • CP425-5123 Parts List
  • CP425-5123 Torque Specifications


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • CP425-5123 Installation Instructions
  • CP425-5123 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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