A German-made triplex plunger positive displacement pump with reciprocating plungers for direct or belt drive applications.

Anodized 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 316 stainless steel manifold.

Gearbox and bell housings (to connect to gasoline, diesel, electric or hydraulic drive), couplers (aluminum or Delrin).

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

  • P221A-5123 Exploded View
  • P221A-5123 Parts List
  • P221A-5123 Torque Specifications
  • Giant Industries Limited Warranty
  • P221A-5123 Installation Instructions
  • P221A-5123 Repair Instructions
  • Troubleshooting Guide


U.S. Metric
1750 RPM
Flow 2.3 GPM 8.9 L/min
Pressure 2000 PSI 140 bar
Power Required 3.3 hp 2.4 kW
3450 RPM
Flow 4.6 GPM 17.6 L/min
Pressure 2000 PSI 140 bar
Power Required 6.5 hp 4.9 kW
Common Specifications
Maximum Inlet Pressure 90 PSI 6.2 bar
Maximum Temperature 160 °F 40 °C
Plunger Diameter 0.71″ 18 mm
Stroke 0.28″ 7.0 mm
Crankshaft Diameter 24 mm
Crankshaft Rotation Top of Pulley Towards Manifold
Key Width 0.31″ 8mm
Crankshaft Mounting Either Side
Inlet Ports (2) 1/2″ BSP
Discharge Ports (2) 3/8″ BSP
Crankcase Oil Capacity 8.1 fl. oz. 0.24 L
Weight 13.25 lbs. 6.0 kg
Key Component Material
Manifold 316 Stainless Steel
Plungers Solid Ceramic
Valves 316TI Stainless Steel
Seals Nitrile With Fabric Reinforcing
Gear End Aluminum

Click the image to enlarge


RPM GPM 1000 PSI 1500 PSI 2000 PSI
1450 2.0 1.4 2.1 2.8
1750 2.3 1.7 2.5 3.3
3000 4.1 2.8 4.2 5.7
3200 4.3 3.0 4.4 5.9
3450 4.7 3.2 4.9 6.5

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 #09602-0023
21 06815 O-Ring 3
23 08087-0020 Grooved Seal, Teflon 6
23B 06163 Drip Shield 3
24 07904 Pressure Ring 3
Valve Assembly Kit – Part #09139-0023
26A 07946-5123 Valve Assembly 6
31 06817 O-Ring 6
33 06818 O-Ring 6
Oil Seal Kit – Part #09144
19 08356 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.