WOJET Triplex Plunger Pressure Washer Pump 3600 PSI 2.7 GPM, 3/4" Shaft Horizontal 5–7HP, Pre-filled Oil

WOJET Triplex Plunger Pressure Washer Pump is a heavy-duty 3600 PSI, 2.7 GPM replacement pump with a 3/4" shaft, built for 5–7 HP horizontal-shaft engines and designed to restore and extend pressure-washer performance.

Whether you’re repairing a homeowner unit or keeping a fleet on the road, this WOJET pump kit supplies the pressure, flow and durability expected from a commercial-grade triplex assembly. It’s a direct-fit replacement option for many popular engines and frames — including Honda GX160/GX190/GX200, various Simpson and DeWalt models, and several Briggs & Stratton and Generac applications — and arrives pre-filled with oil, pre-sealed, and ready to install with basic hand tools.

How does this pump restore cleaning performance?

Replacing a worn or leaking pump returns your machine’s original PSI and flow, so surfaces clean faster and rinses finish evenly. The triplex plunger design provides steady pressure under load and improved detergent metering for consistent results.

• 3600 PSI, 2.7 GPM rating for heavy-duty cleaning tasks
• Polished ceramic pistons and forged brass manifold for wear resistance
• Adjustable unloader valve to fine-tune operating pressure
• Pre-sealed and oil-filled crankcase for immediate use

What installation and compatibility should I expect?

The kit is made for horizontal-shaft engines with a 3/4" shaft and 5–7 HP (160–220 cc) class powerplants; it fits many common OEM frames. Basic mechanical skills and a few hand tools are all that’s needed to swap the old pump for this direct-replacement assembly.

• Direct-replacement fit for Honda GX160/GX190/GX200 and similar engines
• Includes mounting bolts, shaft key and detergent tube for fast install
• 3/8" quick-connect outlet and 3/4" garden-hose-style inlet connections
• Self-priming allows flexible water-source connections during setup

How does the integrated unloader and self-priming help longevity?

The integrated unloader valve prevents thermal buildup by letting water continue circulating when the trigger is released, reducing heat stress and wear. The self-priming feature adds operational flexibility and limits cavitation risk when drawing water from alternate sources.

• Unloader provides a continuous cool-down flow to protect internal parts
• Self-priming capability enables water draw from tanks, pools, or buckets
• Corrosion-resistant brass pump head extends service life in wet environments
• Powder-coated aluminum crankcase resists external wear and corrosion

What maintenance and support are included?

The pump ships pre-filled with oil and pre-sealed, lowering the chance of early leaks and simplifying first use. WOJET supplies hardware and a customer support path to help troubleshoot fitment or performance questions.

• Pre-filled, pre-sealed crankcase reduces setup steps and leaks
• Includes detergent tube, mounting bolts and shaft key for complete install
• Adjustable unloader knob for routine pressure tuning
• Customer support available for compatibility checks and issues

Who is this for: This WOJET Triplex Plunger Pump is aimed at contractors, rental operators, and homeowners who need a rugged replacement for worn pressure-washer pumps. If your machine uses a 5–7 HP horizontal-shaft engine with a 3/4" shaft and you want to restore original pressure and flow for tough cleaning jobs, this pump delivers the build quality, cooling protection, and installation convenience required for reliable service.