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 www.P65Warnings.ca.gov

  • P422 Exploded View
  • P422 Parts List
  • P422 Torque Specifications
  • P422 Technical Drawing
  • Giant Industries Limited Warranty
  • P422 Installation Instructions
  • P422 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Flow 9.9 GPM 37.3 L/min
Max Discharge Pressure (Continuous) 2600 PSI 180 bar
Max Discharge Pressure (Intermittent) 3000 PSI 200 bar
Crankshaft Speed 1450 RPM
Max Inlet Pressure 145 PSI 10 bar
Maximum Temperature 160 °F 70 °C
Plunger Diameter 0.87″ 22 mm
Stroke 0.94″ 24 mm
Crankshaft Diameter 1.10″ 28 mm
Crankshaft Rotation Top of Pulley Towards Manifold
Key Width 0.32″ 8 mm
Crankshaft Mounting Either Side
Inlet Ports (2) 1″ NPT
Discharge Ports (2) 3/4″ NPT
Crankcase Oil Capacity 30.4 fl. oz. 0.9 L
Weight 38.3 lbs. 17.4 kg
Volumetric Efficiency @ 1450 RPM 0.95
Menhanical Efficiency @ 1450 RPM 0.83
NPSHR 22.3 Ft.-Head 6.8 mWs
Key Component Material
Manifold Forged Brass
Plungers Solid Ceramic Oxide
Valves High Grade Stainless Steel
Seals Nitrile With Fabric Reinforcing
Gear End Aluminum

Click the image to enlarge


RPM GPM 1000 PSI 1500 PSI 2610 PSI 3000 PSI*
900 6.1 4.2 6.3 11.0 12.6
1050 7.2 5.0 7.5 13.0 14.9
1160 7.9 5.4 8.2 14.2 16.3
1300 8.9 6.1 9.2 16.0 18.4
1450 9.9 6.8 10.2 17.8 20.5

*Intermittent duty only!

Horsepower Requirements

The ratings shown are the power requirements for the pump. Gas engine power outputs must be approximately twice the pump power requirements shown above.

We recommend a 1.15 service factor be specified when selecting an electric motor as the power source. To compute specific pump horsepower requirements use the following formulas:
Electric HP = (GPM X PSI)/1450
Gas HP = (GPM X PSI)/1100

*Engine power varies based on horizontal or vertical orientation, as well as by makes and models from each manufacturer.


Plunger Packing Kit – Part #09295
21 07266 O-Ring 3
23 06249 V-Sleeve with Support Ring 3
23B 13390 Weep Seal 3
24 06252 Pressure Ring 3
Valve Assembly Kit – Part #09143
27A 08408 Valve Assembly, Complete 6
33 07214 O-Ring 6
Oil Seal Kit – Part #09641
19 05444 Oil Seal 3

Repair Kits Available

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.

Service & Repair

Giant provides service on each pump and accessory that we sell. Many basic repair procedures are covered in the Giant repair manual. For all other questions on service or repair needs please contact your local Giant distributor.