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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
Flow5.5 GPM20.8 L/min
Maximum Discharge Pressure4350 PSI300 bar
Crankshaft Speed1450 RPM
Power16.5 HP12.3 KW
Crankshaft Speed (High)5.5 RPM
Intermittent Flow5.5 GPM20.8 L/min
Intermittent Discharge Pressure5100 PSI350 bar
Intermittent Crankshaft Speed1450 RPM
Intermittent Power Consumption19.3 HP14.4 HP
Max Temperature160 °F70 °C
Inlet Port Size(2) 3/4" BSP
Discharge Port Size(2) 1/2" BSP
Plunger Diameter0.71 in.18 mm
Stroke0.71 in.20 mm
Maximum Inlet Pressure145 PSI10 bar
Crankshaft Diameter28 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
NPSHR8.7 mWs

Horsepower Specifications

RPM GPM 2000 PSI 3000 PSI 4350 PSI 5075 PSI*
920 3.5 4.8 7.2 10.5 12.2
1050 4.0 5.5 8.3 12.0 14.0
1185 4.5 6.2 9.3 13.5 15.8
1315 5.0 6.9 10.3 15.0 17.5
1450 5.5 7.6 11.4 16.5 19.3

*Intermittent duty only!

Specification Images

Additional Drawings

  • P455B Exploded View
  • P455B Parts List
  • P455B Torque Specifications


  • Giant Industries Limited Warranty
  • P455B Installation Instructions
  • P455B Repair Instructions
  • Troubleshooting Guide


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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