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A German-made reciprocating triplex plunger pump.

Spheroidal cast iron 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 nickel-plated spheroidal cast iron 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
Flow20.6 GPM78.0 L/min
Maximum Discharge Pressure4060 PSI280 bar
Crankshaft Speed1000 RPM
Power56.0 HP41.8 KW
Max Temperature140 °F60 °C
Inlet Port Size(3) 1-1/2" BSP
Discharge Port Size(2) 1" BSP
Plunger Diameter1.1 in.28 mm
Stroke1.81 in.46 mm
Maximum Inlet Pressure145 PSI10 bar
Crankshaft Diameter1.38 in.35 mm
Crankshaft MountingEither Side
Crankcase Oil Capacity1.2 Gal 4.6 L
Weight179 lbs.81 kg

Horsepower Specifications

RPM GPM 1000 PSI 2000 PSI 3000 PSI 4060 PSI
600 12.4 8.6 17.1 25.7 34.7
700 14.4 9.9 19.9 29.8 40.3
800 16.5 11.4 22.8 34.1 46.2
900 18.5 12.8 25.5 38.3 51.8
1000 20.6 14.2 28.4 42.6 57.7

Specification Images

Additional Drawings

  • GP5128-BSP Exploded View
  • GP5128-BSP Parts List
  • GP5128-BSP Torque Specifications


  • Giant Industries Limited Warranty
  • GP5128-BSP Installation Instructions
  • GP5128-BSP Repair Instructions
  • Troubleshooting Guide


  • Manifold: Nickel-Plated Spheroidal Cast Iron
  • Crankcase: Spheroidal Cast Iron
  • Plunger: Solid Ceramic Oxide
  • Valve: Stainless Steel
  • Seal: Nitrile with Fabric Reinforcing

Sample Pump

Our Company

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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