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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
Flow24.8 GPM93.8 L/min
Maximum Discharge Pressure1600 PSI110 bar
Crankshaft Speed800 RPM
Power27.2 HP20.3 KW
Max Temperature160 °F70 °C
Inlet Port Size1-1/4" BSP
Discharge Port Size1" BSP
Plunger Diameter1.42 in.36 mm
Stroke1.57 in.40 mm
Maximum Inlet Pressure29 PSI2 bar
Crankshaft Diameter1.5 in.38 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity US0.79 gal 3.0 L
Manifold Material Aluminum-Bronze
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 #09720
36 13291 Leakage Seal 3
38 07140 O-Ring 6
40 07144 V-Sleeve 6
Valve Assembly Kit – Part #09196
44A 07150 O-Ring 9
44B 06266 Support Ring 3
46A 07064 Valve Seat 3
46B 07063 Valve Plate 3
46C 07062-0100 Valve Spring 3
Oil Seal Kit – Part #09577
31 07133 Oil Seal 3

Horsepower Specifications

RPM GPM 500 PSI 750 PSI 1000 PSI 1600 PSI
400 12.4 4.3 6.4 8.6 13.7
500 15.5 5.4 8.0 10.7 17.1
600 18.6 6.4 9.6 12.8 20.5
700 21.7 7.5 11.2 15.0 24.0
800 24.8 8.6 12.8 17.1 27.4

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • LP121 Exploded View
  • LP121 Parts List


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • LP121 Installation Instructions
  • LP121 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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