Skip to Main Content

CAT Pumps 66DX50G1I Direct Drive Gas Flanged Triplex Plunger Pump - 5.0 GPM, 3500 PSI, 3250 RPM

Mfr. Model #:
KR Part #:
26.47 lbs
Usually Ships in 2 Weeks
Now Only!
A triplex plunger pump for direct mounting to gas engines. Manifold is made with brass. Handles flow rates of 5.0 GPM and pressures up to 3500 PSI.

Technical Specifications

Max PSI: 3500
RPM: 3250
Stroke: 10.7 mm
Bore: 15.9 mm
Inlet Port: 1/2 inch
Outlet Port: 3/8 inch
Crankcase Capacity: 18 ounce
Shaft Diameter: 1 inch
Max Temperature: 140 degrees F
Max GPM: 5

Product Description

Gas Engine Flanged Pump

The CAT Pumps 66DX50G1I is a reciprocating triplex plunger pump that includes a flange mount used for direct mounting to most gas engines. Manifold is constructed using forged brass and valve assemblies use 304 Stainless Steel. Plungers are manufactured using solid ceramic with seals and O-rings made with NBR (Buna-N). Includes a modular regulating unloader with built-in bypass system to protect the pump from overpressure.


  • Maximum Flow: 5.0 GPM
  • Maximum Pressure: 3500 PSI
  • RPM: 3250
  • Drive Type(s): Direct, Flanged
  • Material: Brass 
  • Stroke: 0.421"
  • Weight: 26.15 lbs.
  • Common Specifications:
  • Inlet Pressure Range: Flooded to 75 PSI
  • Max. Liquid Temp. (NBR): 140° F
  • Bore: 0.629"
  • Crankcase Capacity: 18 oz.
  • Inlet Ports (2): 1/2" NPT(F)
  • Discharge Ports (2): 3/8" NPT (M)
  • Shaft Diameter (Hollow): 1.0"
  • Dimensions: 11.73 x 10.51 x 8.15"


  • Triplex plunger design ensures a smooth liquid flow.
  • Compact flange mount permits easy, direct mounting to most gas engines. *
  • Modular regulating unloader with built-in bypass ensures system pressure control and pump protection.**
  • Fixed chemical injector aids in cleaning flexibility.
  • Pump comes standard with NBR seals. Alternative seal materials are available for higher temperature or chemical compatibility.

*Gas Mounting Flange: SAE J609, Flange B, Extension 4 (1"¯), Shaft Length = 3 1/4", PilotØ= 5 3/4", BC.Ø=6 1/2", Thread 3Ú8"-16 UNC Tap

**Available without an unloader. (66DX50GG1)

Product Reviews

Frequently Asked Questions