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4400 PSI 4.2 GPM 1" Triplex Pressure Washer Pump

4400 PSI 4.2 GPM 1" Triplex Pressure Washer Pump

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PRODUCT

DESCRIPTION

Maximum Pressure. Maximum Flow. Maximum Reliability.

For professionals who demand the best, the 4400 PSI 4.2 GPM 1" Triplex Pressure Washer Pump is a powerhouse built to outperform and outlast. Whether you’re tackling industrial-scale cleaning, preparing surfaces for coatings, or operating a mobile pressure washing business, this commercial-grade pump delivers the pressure, flow, and durability needed for the toughest jobs.

Engineered for high-volume, high-pressure applications, this triplex plunger pump delivers up to 4.2 gallons per minute at 4,400 PSI—making it ideal for cleaning large surfaces, removing stubborn stains, and blasting through grease, grime, and buildup. Featuring an external unloader valve for precise pressure control, a 1-inch horizontal shaft for wide engine compatibility, and an impressive 5-year warranty, this pump is the gold standard for serious cleaning professionals.

With superior heat resistance, heavy-duty components, and field-proven reliability, it’s built for long hours, hard work, and high expectations.

Key Features at a Glance

  • Maximum Pressure: 4,400 PSI

  • Maximum Flow Rate: 4.2 GPM

  • Pump Type: Commercial-grade Triplex Plunger Pump

  • Shaft Size: 1" horizontal, hollow shaft

  • Max Temperature: 60°C / 140°F

  • Weight: 25 lbs

  • Unloader Valve: External, adjustable

  • Warranty: Industry-leading 5-Year limited warranty

Built for Heavy-Duty Demands

At its core, this pump uses a triplex plunger design—the preferred configuration for professional and industrial cleaning systems. Unlike axial pumps or wobble plate designs, the triplex system uses three pistons driven by a crankshaft to deliver consistent, pulsation-free pressure at high volumes.

The benefits are clear:

  • Higher durability under constant use

  • Reduced vibration and wear

  • Consistent water pressure, even during extended run times

  • Smooth, quiet operation for better operator comfort

Whether you’re on a jobsite, cleaning a fleet, or managing a wash bay, this pump delivers the reliable performance your business depends on.

Massive Flow + High Pressure = Unmatched Cleaning Efficiency

This pump produces up to 4.2 GPM of water flow at an incredible 4,400 PSI, making it one of the most powerful pumps in its class. This combination is ideal for:

  • Stripping paint, grime, or graffiti from concrete

  • Cleaning construction equipment, agricultural tools, and heavy-duty vehicles

  • Sanitizing industrial floors, buildings, or work zones

  • Power washing commercial properties, fleets, or large-scale surfaces

  • Operating multi-nozzle systems, flat surface cleaners, or high-flow attachments

The high GPM ensures faster rinsing and broader spray coverage, while the high PSI gives you the cutting force to remove even the most stubborn buildup.

Precision Pressure Control with External Unloader Valve

Equipped with an external unloader valve, this pump gives users precise control over water pressure and ensures safe, efficient operation.

Benefits of an external unloader include:

  • Fast and easy adjustments to system pressure

  • Improved heat dissipation and pump longevity

  • Better compatibility with variable nozzles and long hose runs

  • Simplified maintenance and replacement compared to internal unloaders

The external unloader redirects water when the trigger is released, preventing dangerous pressure buildup and helping extend the life of your system.

Ready for Warm Water Operation

Rated for use with water temperatures up to 60°C / 140°F, this pump is well-suited for degreasing, sanitation, and detergent-based cleaning tasks. Whether you’re removing oil from driveways, working in food processing environments, or deep-cleaning industrial machinery, the pump’s thermal resistance allows for more effective results.

Just pair it with a compatible hot water feed or downstream detergent injector to take full advantage of its capabilities.

Built to Last with Heavy-Duty Construction

At 25 lbs, this pump is rugged, solid, and built for professional environments. Every component is selected for strength and resilience under pressure:

  • Corrosion-resistant brass or anodized manifold

  • Hardened stainless steel plungers and valves

  • Sealed bearings and robust internal seals

  • Protective housing designed for jobsite durability

Whether it's mounted on a trailer, installed on a skid, or used in a fixed bay, this pump stands up to vibration, exposure, and rough handling—day after day.

Engine Compatibility and Easy Installation

The 1" horizontal hollow shaft makes this pump ideal for large-frame gas-powered engines, including models from:

  • Honda (GX390 and up)

  • Kohler

  • Vanguard

  • Lifan

  • Predator

  • Briggs & Stratton Commercial Series

  • Other compatible horizontal-shaft engines

Mounting hardware, bolt patterns, and shaft sizing follow standard commercial engine specs, ensuring a smooth, secure installation with minimal downtime.

Perfect for a Range of Professional Applications

This pump is built for users who operate at a professional level:

  • Pressure washing contractors

  • Fleet maintenance crews

  • Agricultural and construction equipment cleaning

  • Surface preparation teams

  • Industrial maintenance and sanitation professionals

  • Trailer and skid-mounted systems

  • Rental businesses looking for low-maintenance, long-life equipment

From weekly projects to daily commercial use, this pump can handle the pressure—literally.

Specifications

  • Max Pressure: 4400 PSI

  • Max Flow Rate: 4.2 GPM

  • Pump Type: Triplex plunger with crankshaft drive

  • Shaft Size: 1" horizontal, hollow

  • Max Water Temp: 60°C / 140°F

  • Weight: 25 lbs

  • Unloader: External and adjustable

  • Mounting: Direct engine mount

  • Warranty: 5 Years (limited)

Unmatched Warranty Protection

We stand behind this pump with an industry-leading 5-year limited warranty—a testament to the build quality and performance you can expect. If any manufacturer-related issue arises within five years of use, you’ll have access to replacement parts, service support, and dedicated assistance.

It’s the kind of peace of mind only a truly professional-grade product can offer.

The 4400 PSI 4.2 GPM 1" Triplex Pressure Washer Pump is the high-output solution for professionals who demand durability, pressure, and flow at the highest level. With its external unloader, warm-water compatibility, and industrial build quality, it’s a powerful upgrade that increases your efficiency and protects your investment for the long haul.

Power through the toughest cleaning jobs. Install a pump that works as hard as you do.

Compare Pressure Washer

Frequently Asked Questions about Pressure Washers

How to store a pressure washer?

To ensure the durability of your heavy duty pressure washer:

  • Empty the gas tank to prevent fuel from degrading or clogging the engine.
  • Empty the pump and hoses of any remaining water.
  • Perform necessary maintenance before storage.
  • Store in a dry area.
  • Cover.

What is a pressure washer?

A power washer is a cleaning machine that uses a gasoline engine to power a high pressure water pump and nozzle. It’s used to clean driveways, decks, vehicles, outdoor furniture and more by spraying water at high PSI to remove dirt, grime, mold and other debris.Many models also come with a detergent tank for added cleaning power.

How does a power washer work?

A power washer works by drawing water from a connected hose and pumping it through a high pressure nozzle. The gas engine powers the pump which pressurizes the water and then expels it through the nozzle at high speed to clean the surface. The water pressure is measured in PSI (pounds per square inch) and the flow rate is measured in GPM (gallons per minute).Many models also feature adjustable water pressure settings to cater to different cleaning needs. BE makes pressure washing easy with models available for light jobs and heavy duty commercial cleaning projects.

Gas vs Electric power washers?

The main difference is that a gas pressure washer, known for its cleaning power, is powered by a gasoline engine, making it more powerful and portable, while an electric pressure washer is powered by electricity and is generally quieter and lighter.

Gas pressure washers are for heavy duty and large areas due to their durability, whereas electric pressure washers are for smaller jobs.

Your BE electric pressure washer is perfect for smaller jobs and built for portability, and we offer a wide range of electric models. Included with our electric models is a long extension cord for use anywhere around your house.

What to consider?

When choosing a gas pressure washer consider:

  • Pressure (PSI): More PSI means more cleaning power but also more potential for damaging delicate surfaces.
  • Flow Rate (GPM): More GPM means faster cleaning as more water is dispensed.
  • Engine Power: Bigger engines mean more durability and power.
  • Portability: Weight, handle design and wheel size for easier to move.
  • Nozzles: Multiple spray nozzles to adjust the spray pattern for different tasks.
  • Adjustable Nozzle: Allows for fine-tuning the spray intensity and pattern for various cleaning needs.

How much pressure do I need for?

The required pressure (PSI) and cleaning power depend on the surface you’re cleaning:

  • Light duty (car washing, outdoor furniture): 1,300-1,800 PSI.
  • Medium duty (patios, fences, decks): 2,000-3,000 PSI.
  • Heavy duty (driveways, brick walls, large equipment): 3,000+ PSI.

Many pressure washers come with adjustable pressure settings to handle different cleaning tasks effectively.

Can a pressure washing damage surfaces?

Yes, a power washer can damage surfaces if used incorrectly. High pressure water can strip paint, dent soft surfaces or even cause structural damage if the pressure is too high or the nozzle is held too close to the surface. Always use the right PSI for the material you’re cleaning and keep a safe distance from delicate surfaces.

To prevent damage, consider using a model with adjustable pressure settings.

How to maintain your pressure washer?

To ensure the durability and smooth operation of a pressure washer:

  • Change the oil as per manufacturer’s instructions.
  • Clean or replace the air filter to ensure good airflow.
  • Inspect and clean the nozzle regularly to prevent clogs.
  • Drain the gas tank if you’re storing the washer for a long time.
  • Check the hoses for leaks or damage and replace them if needed.
  • Follow regular maintenance requirements to keep the washer in optimal condition.

Can I use a pressure washer in cold weather and low water temperature?

You can use a pressure washer in cold weather but it’s more difficult. The water flow rate in the hoses and pump can freeze and damage the equipment. If you plan to use your pressure washer in cold temperatures make sure to winterize it and store it in a warm area when not in use. You can also use anti-freeze solutions for pressure washers.

Some models are designed to use hot water, which can be particularly effective for cleaning in cold weather.

Do I need any accessories?

Common accessories for power washers: