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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 bronze 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
Flow8.9 GPM33.8 L/min
Maximum Discharge Pressure3625 PSI250 bar
Crankshaft Speed1450 RPM
Power23.1 HP17.2 KW
Max Temperature160 °F70 °C
Inlet Port Size(2) 1" NPT
Discharge Port Size(2) 3/4" NPT
Plunger Diameter0.79 in.20 mm
Stroke1.02 in.26 mm
Maximum Inlet Pressure145 PSI10 bar
Crankshaft Diameter1.1 in.28 mm
Crankshaft RotationTop of Pulley Towards Manifold
Crankshaft MountingEither Side
Crankcase Oil Capacity US33.8 fl. oz. 1.0 L
Weight66 lbs.31 kg
NPSHR24.6 Ft.-head7.5 mWs
Manifold Material Bronze
Crankcase Material Spheroidal Cast Iron
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 #09044
35B 06064 Rear V-Sleeve 3
35D 07266 Rear O-Ring 3
40 07322 V-Sleeve 3
42B 07332 O-Ring 3
Valve Assembly Kit – Part #09802
42B 07332 O-Ring Tension Plug 3
44 07280 Valve Seat 6
44A 07281 O-Ring, Valve Seat 6
45 06791-0100 Valve Plate 6
46 07283 Valve Spring, Discharge 3
46A 06959 Valve Spring, Inlet 3
48A 07332 O-Ring, Tension Plug 3
53 12057 O-Ring 3
53A 12027 O-Ring 3

Horsepower Specifications

RPM GPM 1600 PSI 2000 PSI 3000 PSI 3625 PSI
805 4.9 5.4 6.8 10.1 15.3
900 5.5 6.1 7.6 11.4 13.8
990 6.1 6.7 8.4 12.6 15.3
1085 6.7 7.4 9.2 13.9 16.8
1140 7.0 7.7 9.7 14.5 17.5
1305 8.0 8.8 11.0 16.6 20.0
1450 8.9 9.8 12.3 18.4 22.3

Images Open in new Window/Tab

  • Dimensional Drawing (Side) Open
  • Dimensional Drawing (Front) Open
  • MP4120 Exploded View
  • MP4120 Parts List
  • MP4120 Torque Specifications


Documents open in new window/tab.

  • Giant Industries Limited Warranty
  • MP4120 Installation Instructions
  • MP4120 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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