WOJET Pressure Washer Pump 3/4" Shaft — 3400 PSI 2.5 GPM Horizontal Self-Priming, Die-Cast Aluminum

WOJET's 3400 PSI, 2.5 GPM pressure washer pump is a durable 3/4"-shaft replacement pump that restores performance to compatible gas pressure washers while adding self-priming and easy pressure adjustment.

If your gas-powered pressure washer is underperforming or its pump has failed, this WOJET horizontal axial pump is built to renew its cleaning power. Engineered for engines with 180–225cc (about 6.5–7 HP) and a 3/4" shaft, the unit provides up to 3400 PSI and 2.5 GPM to handle routine exterior tasks like washing cars, cleaning driveways, rinsing siding, and general outdoor maintenance. The kit is made from corrosion-resistant die-cast aluminum, includes a thermal relief valve, and arrives with installation guidance to make swapping pumps straightforward.

Will this WOJET pump fit my engine and pressure washer model?

Compatibility centers on a 3/4" shaft and engines roughly 180–225cc. WOJET lists many common engines it pairs with, and the pump is commonly used as a replacement for popular brands when those mechanical specs match.

• Designed for 3/4" shaft, horizontal mount engines (6.5–7 HP range).
• Compatible engine families include Honda GX/GC series, Briggs & Stratton EX series, Generac OHV, Kohler, Subaru, Lifan, Loncin.
• Before ordering, confirm your engine model, shaft size, PSI and GPM to ensure fit.

How does the adjustable pressure control make cleaning easier?

The pump uses an upgraded unloader that you can adjust by hand—no wrench required—so you can quickly change spray intensity between delicate tasks and heavy-duty cleaning. It simplifies switching from low-pressure rinse to high-pressure cleaning without tools or disassembly.

• Hand-twist unloader: counterclockwise lowers pressure, clockwise increases it.
• M22 outlet and garden-hose inlet for straightforward connections.
• Quick, tool-free adjustments speed up multi-surface jobs.

What does self-priming mean and why is it useful?

This WOJET pump can draw water from open sources like buckets, tanks, or pools, not only from faucet-fed hoses. Self-priming expands where you can operate your washer—useful on job sites, remote properties, or when a garden spigot isn't available.

• Pulls water from alternative sources for mobile or off-grid work.
• Reduces dependence on fixed plumbing for flexible cleaning locations.
• Ideal for agriculture, rental units, pressure-washing services, and remote chores.

How long will this pump last, and how easy is installation?

Constructed from die-cast aluminum, the pump resists rust and includes a thermal relief valve to help prevent overheating. WOJET provides clear installation instructions and a video so many users report completing the swap in roughly ten minutes with basic hand tools.

• Die-cast aluminum body for corrosion resistance and longevity.
• Thermal relief valve protects internal components during heavy use.
• Detailed instructions and video included to simplify replacement.

Who is this for? The WOJET 3400 PSI, 2.5 GPM pump is aimed at homeowners, contractors, rental centers, and anyone with a compatible gas pressure washer who wants a long-lasting, serviceable replacement. It's particularly helpful for users who need a pump that can draw from non-faucet sources, who value quick manual pressure adjustment, or who want to revive an older machine rather than replace the entire unit. If you need help confirming compatibility, provide your engine brand and model, PSI, and GPM and WOJET can verify fitment.