A German-made reciprocating triplex plunger pump for liquid CO2 applications.

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; Teflon seals with EPDM O-rings; stainless steel valves and nickel-plated cast iron 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

  • CGP7255A Exploded View
  • CGP7255A Parts List
  • Giant Industries Limited Warranty
  • CGP7255A Installation Instructions
  • CGP7255A Repair Instructions
  • Troubleshooting Guide


U.S. Metric
Flow 51.7 GPM 196 L/min
Maximum Pressure 1450 PSI 100 bar
Crankshaft Speed 550 RPM
Maximum Inlet Pressure 870 PSI 60 bar
Maximum Temperature -40 ºF to 32 ºF -40 ºC to 0 ºC
Plunger Diameter 2.17″ 55 mm
Stroke 2.05″ 52 mm
Crankshaft Diameter 48 mm
Crankshaft Rotation Top of Pulley Towards Manifold
Key Width 14 mm
Crankshaft Mounting Either Side
Inlet Ports (2) 2-1/2″ BSP
Discharge Ports (2) 1-1/4″ BSP
Crankcase Oil Capacity 1.6 gal 6.0 L
Weight 375 lbs 170 kg
Key Component Material
Manifold Nickel-plated Cast Iron
Plungers Solid Ceramic
Valves Stainless Steel
Seals Teflon with EPDM O-rings
Gear End Cast Iron

Click the image to enlarge


RPM GPM 800 PSI 1000 PSI 1300 PSI 1500 PSI
250 23.4 13.4 16.7 21.7 25.1
350 32.8 18.7 23.4 30.4 35.1
450 42.1 24.1 30.1 39.1 45.1
550 51.5 29.4 36.8 47.8 55.2

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 #CP09593
38A CP13156-0003 O-Ring, EDPM 3
38B CP07721-0003 O-Ring, EDPM 3
39A CP07723 Compact Ring 3
42 CP07711-0020 V-Sleeve, Teflon 6
Valve Assembly Kit – Part #CP09594
51A CP13163 Valve Seat 2
51B CP07653-0003 O-Ring, EDPM 2
51C CP13164 Valve Plate 2
51D CP07732-0100 Valve Spring, 316 S.S 2
51F CP13166 Support Ring 2
51G CP07266-0003 O-Ring, EDPM 2
56A CP07658-0003 O-ring, EDPM 2
56B CP07635 Support Ring 2
56C CP13168 Support Ring 1
56D CP07653-0003 O-Ring, EDPM 2
Oil Seal Kit – Part #CP09221
32 CP07624 Radial Shaft Seal 3
32A CP07625 Shaft Seal 3
33A CP07627 O-Ring, Oil Seal Housing 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.