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CAT Pumps 56RS Reverse Shaft 5.5 GPM 7 Frame Plunger Pump - 3500 PSI

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30.20 lbs
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Reverse shaft rotation version of the CAT Pumps 56 model. Seven frame plunger pump with a steel crankcase and a brass manifold. 1/2" x 3/8" F ports. Max 5.5 GPM and 3500 PSI. Rails sold separately.

Technical Specifications

Bore: 18 millimeter
Crankcase Capacity: 25 ounce
Max GPM: 5.5
Stroke: 24 millimeter
Shaft Diameter: 24 millimeter
RPM: 1210
Max Temperature: 160 degrees F
Max PSI: 3500
Inlet Port: 1/2 inch

Product Description

Reverse Shaft Rotation Plunger Triplex Pump

This CAT Pumps 56RS model pump is rated for a flow up to 5.5 gpm at 3500 PSI pressure. The model 56RS brass pump includes 1/2" female NPT inlet ports and 3/8" female NPT outlet ports. Use this strong, lightweight, high-efficiency triplex pump for car wash systems, desalination, chemical injection, and more!

The 56RS is the reverse shaft version of the standard CAT Pumps 56 model. This triplex style plunger pump has a 304 stainless steel housing, ceramic solid plungers, and a brass forged manifold that is strong and corrosion-resistant. CAT triplex pumps are precisely engineered and designed for smoother liquid flow, extended life, and unmatched durability -even at high pressure levels.


  • 5.5 GPM flow rate
  • 3500 PSI maximum pressure
  • 100-3500 PSI pressure range
  • 24mm stroke (.945")
  • 24mm shaft (.945")
  • 18mm bore (.708)
  • 25 oz. crankcase capacity
  • 1210 RPM
  • 1/2" NPT-F inlet port
  • 3/8" NPT-F outlet port
  • 160° Fahrenheit maximum liquid temperature
  • 7 frame style
  • Flooded to 60 PSI inlet pressure range


  • 13.93" x 8.2" x 6.41"


Superior Design:

  • Triplex plunger design provides smoother liquid flow.
  • Hi-pressure seals are completely lubricated and cooled by the liquid being pumped.
  • Inlet and discharge valve assemblies interchange for easier maintenance.
  • Lubricated lo-pressure seals provide double protection against external leakage.
  • Oil bath crankcase assures optimum lubrication.
  • Close tolerance concentricity of the ceramic plunger maximizes seal life.

Quality Materials:

  • Precision design 304 stainless steel valves and seats are hardened and polished for ultimate seating & extended valve life.
  • Brass manifold is strong and corrosion resistant.
  • Special concentric, high-density, polished, solid ceramic plungers provide a true wear surface and extended seal life.
  • Specially formulated, Hi-Pressure Seals offer unmatched performance & seal life.
  • Die cast aluminum crankcase provides high strength, minimum weight and precision tolerance control.
  • Chrome crankshaft gives unmatched strength and surface hardness.
  • Oversized crankshaft bearings with greater capacity mean longer bearing life.

Easy Maintenance:

  • Wet-end is easily serviced without entering crankcase, requiring less time and effort.
  • Preset packings mean no packing gland adjustment is necessary, reducing maintenance costs.

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