An American-made axial design positive displacement triplex plunger pump for direct drive only.

Aluminum crankcase, machined wobble plates, stainless steel thrust bearings, stainless steel plungers, nitrile seals (with fabric reinforcing), Delrin valves, forged brass manifold, integrated unloader, thermal relief valve and optional fixed or adjustable chemical injector.

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

  • GX2525A Exploded View
  • GX2525A Parts List

Sorry, there are no accessories associated with this product.

  • Giant Industries Limited Warranty
  • GX2525A Installation Instructions
  • GX2525A Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Flow 2.5 GPM 9.5 L/min
Maximum Discharge Pressure 2500 PSI 172 bar
Crankshaft Speed 3450 RPM
Maximum Inlet Pressure 90 PSI 6.2 bar
Max. Temperature of Pumped Fluids 80 ºF 27 ºC
Plunger Diameter 0.63″ 16 mm
Stroke 5.1 mm (7.1º angle)
Crankshaft Rotation Either Direction
Key Width (Horizontal) 3/4″ x 3/16″ Keyway
Key Width (Vertical) 7/8″ x 3/16″ Keyway
Inlet Ports 1/2″ NPT
Discharge Ports 3/8″ NPT
Crankcase Oil Capacity (Horizontal) 4.1 fl. oz. 121 ml
Crankcase Oil Capacity (Vertical) 4.7 fl. oz. 138 ml
Weight 9 lbs. 4.1 kg
Key Component Material
Manifold Brass
Plungers Stainless Steel
Valves Delrin
Seals Nitrile With Fabric Reinforcing
Gear End Aluminum

Click the image to enlarge


RPM GPM 1000 PSI 1500 PSI 2000 PSI 2500 PSI
3450 2.5 1.7 2.6 3.4 4.3


RPM GPM 1000 PSI 1500 PSI 2000 PSI 2500 PSI
3450 2.5 2.3 3.4 4.5 5.7

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 #09465
20 06290 Support Ring 3
21 06315 V-Sleeve 3
Valve Assembly Kit – Part #09466
18 07374 Valve Spring 6
19 06267 Guided P-Valve 3
36 06295 Discharge Valve Cone 3
Oil Seal Kit – Part #09468
15 06316 Plunger Oil Seal 3
Unloader Repair Kit – Part #09467
23 12007 O-Ring 2
25 12031-0002 Back-up Ring 2
26 07937 O-Ring 2
27 08638 O-Ring 1
28 06256 Seat 1
29 06227 8mm ball 1
41 12326 O-Ring 1

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.