WOJET Triplex Plunger Pressure Washer Pump 4400 PSI 4 GPM Blue

Description

Product Overview

The WOJET Triplex Plunger Pressure Washer Pump is engineered to meet the demanding requirements of professional-grade pressure washing. Constructed with a corrosion‑resistant brass pump head, polished ceramic pistons, and a forged brass manifold, the pump offers exceptional durability and resistance to the harsh chemicals often used in cleaning applications. The powder‑coated aluminum crankcase adds lightweight strength while protecting against impact and wear, ensuring a long service life even under continuous heavy‑duty operation.

Designed for 4400 PSI and a flow rate of 4 GPM, this pump provides the power needed to tackle stubborn grime, oil stains, and graffiti on a variety of surfaces. The integrated unloader valve automatically releases pressure when the trigger is released, preventing engine stalling and reducing heat buildup. This feature not only safeguards the engine but also extends the pump’s operational lifespan by minimizing wear during idle periods.

Self‑priming capability sets this pump apart from many competitors. The built‑in siphon hose with filter allows the pump to draw water from a bucket, tank, or pool without the need for a separate priming device, offering flexibility in field conditions where water sources may vary. The 1″ shaft design ensures a perfect fit for a wide range of 9‑15 HP horizontal‑shaft engines, including popular models from Honda, Dewalt, Simpson, and Generac.

Additional components include a shaft key, mounting bolts, and a siphon hose, providing a complete replacement kit that can be installed quickly with basic tools. The pump’s compact dimensions (11.4″ L × 9″ W × 7.5″ H) and weight of 17.5 lb make it easy to handle and install, while the robust construction maintains performance under demanding conditions.

Usage

This pump excels in a variety of commercial and residential settings. For contractors cleaning construction sites, the high pressure and flow rate quickly remove concrete residue, oil, and debris from equipment and surfaces. Homeowners tackling driveway cleaning, deck restoration, or vehicle washing will appreciate the pump’s ability to deliver consistent power without frequent interruptions.

Because of its self‑priming feature, the pump is ideal for remote locations where a direct water source may not be readily available. Users can connect the siphon hose to a portable water tank, a large bucket, or even a swimming pool, making it versatile for landscaping, pool maintenance, and agricultural applications. The integrated unloader valve ensures that the engine remains cool during extended use, which is especially valuable in hot climates or when operating for long periods.

Designed for compatibility with Honda GX270, GX340, GX390, Dewalt 4000/4200, and similar engines, the pump fits seamlessly into existing pressure washer systems, reducing downtime and eliminating the need for costly professional re‑engineering. Whether you are upgrading an older unit or replacing a worn‑out pump, this kit restores full performance and reliability.

Why Choose Us

WOJET is a trusted brand known for delivering high‑quality components that meet rigorous industry standards. Each pump undergoes thorough testing for pressure tolerance, flow consistency, and durability before leaving the factory. Our commitment to quality is reflected in the use of premium materials such as brass, stainless steel, and powder‑coated aluminum, which together provide resistance to corrosion, wear, and temperature extremes.

Beyond the product itself, WOJET offers comprehensive customer support, including detailed installation guides, responsive technical assistance, and a warranty that covers manufacturing defects. Our after‑sales service ensures that you have the resources needed to keep your pressure washer operating at peak performance, minimizing downtime and maximizing return on investment.

Key Features

• Corrosion‑resistant brass pump head with polished ceramic pistons for long‑lasting performance.
• Self‑priming siphon hose with filter lets you draw water from any source without extra equipment.
• Integrated unloader valve prevents engine overheating and reduces wear during idle periods.
• Compatible with a wide range of 9‑15 HP horizontal‑shaft engines, ensuring a perfect fit.
• WOJET’s dedicated support team provides installation help and warranty coverage for peace of mind.

FAQ

What engines are compatible with this pump?

The pump is designed for 9‑15 HP (90‑440 cc) horizontal‑shaft engines with a 1″ shaft. It fits Honda GX270, GX340, GX390, Dewalt 4000/4200, Simpson PS60869, Generac 9‑13 HP models, and other similar engines.

How does the self‑priming feature work?

The self‑priming system includes a siphon hose with a built‑in filter that creates a vacuum when the pump starts. This vacuum draws water from a bucket, tank, or pool, allowing the pump to operate without a separate priming device.

What is the purpose of the integrated unloader valve?

The unloader valve releases pressure when the trigger is released, protecting the engine from overheating and preventing stalling. It ensures smoother operation and extends the life of both the pump and engine.

Is installation difficult?

Installation is straightforward and can be completed with basic hand tools. The kit includes all necessary components—pump, shaft key, mounting bolts, and siphon hose—plus a detailed instruction manual to guide you through the process.

What warranty does WOJET provide?

WOJET offers a limited warranty that covers manufacturing defects for a specified period. Contact our customer service team for exact warranty terms and assistance with any issues you may encounter.