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A German-made triplex plunger positive displacement pump with reciprocating plungers for 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; Teflon nitrile seals with EPDM O-Rings; stainless steel valves and forged brass manifold.

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
Flow6.4 GPM24.3 L/min
Maximum Discharge Pressure1740 PSI120 bar
Crankshaft Speed750 RPM
Power7.7 HP5.7 KW
Max Temperature32 °F0 °C
Inlet Port Size(2) 1" BSP
Discharge Port Size(2) 3/4" BSP
Plunger Diameter1.02 in.25 mm
Stroke0.98 in.24 mm
Maximum Inlet Pressure500 PSI35 bar
Crankshaft Diameter28 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
Weight38.3 lbs.17.4 kg
Manifold Material Forged Brass
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, EPDM 3
22 CP08059 O-Ring 3
23 CP06144 Grooved Seal, Brown 3
23B CP12255-0020 Grooved Seal, Teflon 3
24 CP08376 Pressure Ring 6
Valve Assembly Kit – Part #CP09596
27A CP04643 Valve Assembly 6
33 CP07214-0003 O-Ring, EPDM 6
Oil Seal Kit – Part #CP09641
19 CP05444 Oil Seal 3

Horsepower Specifications

RPM GPM 500 PSI 1000 PSI 1500 PSI 1740 PSI
350 3.00 1.0 2.1 3.1 3.6
450 3.85 1.3 2.7 4.0 4.6
550 4.71 1.6 3.2 4.9 5.6
650 5.56 1.9 3.8 5.8 6.7
750 6.42 2.2 4.4 6.6 7.7

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • CP420 Exploded View
  • CP420 Parts List
  • CP420 Torque Specifications


Documents open in new window/tab.

  • Limited Warranty
  • CP420 Installation Instructions
  • CP420 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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