CAT 291 Plunger Pump – 3.5 GPM, 1200 PSI

Model: 291
Category: Pressure Washer Pumps → Piston Pumps
Type: CAT 291 Triplex Uniflow Piston Pump – 3.5 GPM, 1200 PSI, 1200 RPM, 16.5mm Shaft

The CAT Pumps 291 Plunger Pump is a compact triplex positive displacement reciprocating piston pump designed for dependable low-RPM belt-drive applications. Built with a 316 stainless steel manifold, 304 stainless steel valve assemblies, chrome-plated 304 stainless steel cylinders and sleeves, and standard NBR (Buna-N) seals and O-rings, this pump is engineered for reliable performance, strong suction, and smooth fluid delivery.

Key Features

• Genuine OEM CAT Pumps 291 triplex Uniflow piston pump

• Delivers 3.5 GPM at 1200 PSI

• Operates at 1200 RPM

• Designed for low-RPM belt-drive applications

• Triplex Uniflow design for continuous forward liquid flow

• Mechanically actuated inlet valves for strong lift and easier priming

• 316 stainless steel manifold for corrosion resistance

• 304 stainless steel valve assemblies

• Chrome-plated 304 stainless steel cylinders and sleeves

• Standard NBR (Buna-N) seals and O-rings

Technical Specifications

Product Name: Triplex Uniflow Piston Pump
Manufacturer: CAT Pumps
Part Number: 291

Flow Rate: 3.5 GPM
Maximum Pressure: 1200 PSI
RPM: 1200
Shaft Size: 16.5 mm
Bore Diameter: 20 mm
Stroke: 12 mm
Weight: 12.1 lbs.
Condition: New

Construction Details

• 316 stainless steel manifold

• 304 stainless steel valve assemblies

• Chrome-plated 304 stainless steel cylinders and sleeves

• Standard NBR (Buna-N) seals and O-rings

Design Advantages

• Triplex Uniflow design provides continuous forward liquid flow for smoother operation

• Wetted cups and floating pistons are lubricated and cooled by pumped liquid for longer cup life

• Mechanically actuated inlet valves create strong lift and easier priming

• Suitable for applications requiring dependable low-speed piston pump performance

• Alternative seal materials may be available for higher temperature or chemical compatibility

Typical Applications

• Belt-drive pressure washer and pumping systems

• Industrial and commercial low-RPM fluid transfer applications

• Systems requiring strong suction and easy priming

• Applications involving corrosion-resistant piston pump construction

• Equipment needing a 3.5 GPM 1200 PSI triplex piston pump