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A German-made reciprocating triplex plunger pump.

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) 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
Flow13 GPM48.8 L/min
Maximum Discharge Pressure3045 PSI210 bar
Crankshaft Speed1450 RPM
Power27.1 HP20.2 KW
Max Temperature160 °F70 °C
Inlet Port Size(2) 1" BSP, (2) 3/4" BSP
Discharge Port Size(2) 3/4" BSP
Plunger Diameter0.98 in.25 mm
Stroke0.94 in.24 mm
Maximum Inlet Pressure145 PSI10 bar
Crankshaft Diameter28 mm
Crankshaft RotationTop of Pulley Towards Manifold
Key Width8 mm
Crankshaft MountingEither Side
Crankcase Oil Capacity US30.4 fl. oz. 0.9 L
Weight42 lbs.19 kg
NPSHR32.8 Ft.-head10 mWs
Manifold Material Forged Brass
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 #09723
20A 07266 O-Ring 3
21A 07281 O-Ring 6
21B 05967 Support Ring 6
23 12254 V-Sleeve 3
23B 12255 Weep Seal 3
24 08376 Pressure Ring 6
25B 02009 O-Ring 2
Valve Assembly Kit – Part #09724
27A 06936 Valve Assembly, Complete 6
33 05972 O-Ring 6
Oil Seal Kit – Part #09641
19 05444 Oil Seal 3

Horsepower Specifications

RPM GPM 1000 PSI 1500 PSI 2000 PSI 3045 PSI
785 7.1 4.9 7.3 9.7 14.8
900 8.1 5.6 8.4 11.2 17.0
1010 9.1 6.3 9.4 12.5 19.1
1120 10.1 6.8 10.2 13.9 21.2
1240 11.2 7.7 11.5 15.4 23.4
1450 13.0 8.8 13.4 17.9 27.3

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • P420HP Exploded View
  • P420HP Parts List


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • P420HP Installation Instructions
  • P420HP 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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