Comet RW4040S Triplex Pump – 4.0 GPM @ 4000 PSI – 1450 RPM – 24mm Shaft

Part Number: RW4040S
Category: Pressure Washer Pumps → Triplex Pumps → Belt Drive Pressure Washer Pumps
Type: Comet RW4040S Triplex Plunger Pump

The Comet RW4040S Triplex Pump is a professional-grade belt-drive pressure washer pump designed for commercial, industrial, agricultural, and contractor cleaning applications. Built with Comet's proven triplex plunger technology, the RW4040S delivers reliable performance, smooth operation, and long service life in demanding pressure washing environments.

Image shown for illustrative purposes only

Key Features & Benefits

• Genuine Comet RW4040S Triplex Pressure Washer Pump
• Produces up to 4.0 GPM
• Rated for 4000 PSI
• Heavy-duty belt-drive design
• Slow-speed 1450 RPM operation
• Durable triplex plunger pump construction
• 24mm solid shaft
• Smooth pressure delivery with reduced pulsation
• Ideal for commercial and industrial applications
• Suitable for hot water and cold water pressure washer systems
• Designed for continuous-duty operation
• Built for long service life and dependable performance

Technical Specifications

Manufacturer: Comet
Model: RW4040S
Pump Type: Triplex Plunger Pump
Pump Style: Belt Drive

Maximum Rated Pressure: 4000 PSI
Flow Rate: 4.0 GPM

Operating Speed: 1450 RPM

Shaft Size: 24mm Solid Shaft

Inlet Connection: 1/2" Female NPT

Discharge Connection: 3/8" Female NPT

Required Motor Power: 11 HP Electric Motor

Required Engine Power: 14.5 HP Gasoline Engine

Drive Type: Belt Drive

Typical Applications

• Commercial pressure washer systems
• Industrial cleaning equipment
• Fleet washing operations
• Equipment and machinery cleaning
• Agricultural cleaning systems
• Property maintenance services
• Hot water pressure washers
• Cold water pressure washers
• Pressure washing trailers
• Custom pressure washer skids
• Municipal maintenance operations

Performance Advantages

• Delivers 4.0 GPM at 4000 PSI for powerful professional cleaning performance
• Triplex plunger design provides smooth operation and reduced pulsation
• Slow-speed 1450 RPM operation reduces wear and extends service life
• Belt-drive configuration minimizes vibration and operating temperatures
• 24mm shaft supports demanding commercial and industrial applications
• Compatible with both electric and gasoline-powered drive systems
• Threaded NPT ports allow simple plumbing integration
• Suitable for continuous-duty pressure washing environments
• Ideal balance of pressure and flow for professional cleaning applications
• Built with Comet's trusted engineering and commercial-grade durability

Installation Note

Do not install or operate the RW4040S without a properly sized unloader valve and/or pressure regulator. Professional installation is recommended to ensure safe operation, proper system performance, and maximum pump longevity.