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CAT Pumps 390 Triplex Positive Displacement Piston Pump - 12 GPM, 1200 RPM, 600 PSI

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20.20 lbs
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Belt-drive piston pump with a chrome-plated brass manifold and hard stainless steel components. 12 GPM, 1200 RPM, 600 PSI.

Technical Specifications

RPM: 1200
Max PSI: 600
Max GPM: 12
Max Temperature: 140 degrees F
Shaft Diameter: 20 millimeter
Stroke: 16 millimeter
Inlet Port: 1 inch
Crankcase Capacity: 21 ounce
Bore: 32 millimeter

Product Description

12 GPM Brass Manifold Piston Pump

The CAT Pumps 390 model is a positive displacement, reciprocating pump with a three piston rod triplex design. This five frame pump features a brass manifold, 304 stainless steel valve assemblies, chrome-plated 304 stainless steel cylinders, and standard Buna-N o-rings and seals.

The CAT Pumps 390 pump has a low RPM that is designed for belt drive applications. Its Uniflow design includes a mechanically actuated inlet valve that provides constant forward flow and strong suction. 1" NPTM x 1/2" NPTF ports are located on the side for easy plumbing. Maximum flow rate of 12 GPM and a maximum pressure rating of 600 PSI. Extreme durability and incredible abrasion resistance make this perfect for demanding environments like high-volume car washes and commercial pressure washing.

Dimensions: 14.3" x 10.0" x 5.28"


  • Maximum Flow: 12 GPM
  • Minimum Pressure: 100 PSI
  • Maximum Pressure: 600 PSI
  • RPM: 1200
  • Inlet Port Size: 1" NPT (M)
  • Discharge Port Size: 1/2" NPT (F)
  • Drive Type: Belt
  • Manifold Material: Brass
  • Bore: 1.26" (32 mm)
  • Stroke: .629 (16 mm)
  • Maximum Liquid Temperature: 140° Fahrenheit
  • 18.8 lbs. 

Superior Design:

  • Triplex Uniflow design provides continuous forward liquid flow for smooth operation.
  • Wetted cups and floating pistons are lubricated and cooled by pumped liquid for long cup life.
  • Mechanically actuated inlet valves give strong lift and easy prime.
  • Precision design 304 stainless steel valves and seats are hardened and polished for ultimate seating and extended valve life.
  • Oil bath crankcase assures optimum lubrication.
  • 100% wetted seal design allows pumped liquid to cool and lubricate for longer life.

Quality Materials:

  • Cylinder and sleeve wear surfaces are hard chrome plated 304 stainless steel for maximum durability and abrasion resistance.
  • Chrome-plated brass manifold for strength and corrosion resistance.
  • Special high strength TNM connecting rods offer superior bearing quality strength.
  • Chrome-moly crankshaft gives unmatched strength and surface hardness.
  • Oversized crankshaft bearings with greater loading capacity mean longer bearing life.

Easy Maintenance:

  • Stepped stainless steel piston rod with chrome-plated, stainless steel sleeve allows easy replacement from front of pump.
  • All wet-end wear parts are easily serviced without entering crankcase, requiring less time and effort.
  • Wear parts are available in convenient kits.

Product Reviews

Frequently Asked Questions

Question:will a 7.5 hp elec motor work for this pump - tim (01/25/2021)
Response:Yes, it will.