Biswing Pressure Washer Pump for 3/4in Horizontal Shaft — 3400 PSI, 2.5 GPM Aluminum Replacement for 6.5–7HP Gas Washers

The Biswing Pressure Washer Pump is a horizontal axial plunger replacement pump delivering up to 3400 PSI and 2.5 GPM for 3/4" shaft cold-water gas pressure washers.

This compact replacement pump is built for gas-powered cold-water pressure washers with 3/4" horizontal shafts and 6.5–7 HP (180–225 cc) engines. Constructed from aluminum alloy, it includes a thermal relief valve, standard garden hose inlet, M22 high-pressure outlet, and a small hardware kit so you can swap pumps quickly and get back to cleaning driveways, vehicles, siding and outdoor equipment.

Will this pump fit my gas pressure washer?

If your machine uses a 3/4" horizontal shaft and is in the 6.5–7 HP range, this pump is designed to fit. It accepts a 3/4" NH garden hose inlet and an M22 threaded high-pressure outlet, common on many consumer models.

• Compatible with horizontal 3/4" shafts only — verify your engine shaft size first.
• Made to work with engines around 180–225 cc (6.5–7 HP).
• Includes M22 high-pressure outlet and 3/4" NH inlet to match standard hoses.
• Often used as a replacement for brands like Simpson, Ryobi and Honda models with matching shaft and hose connections.

How does the Biswing pump perform on heavy cleaning jobs?

This pump delivers up to 3400 PSI at 2.5 GPM, offering strong cleaning power for typical residential and light commercial tasks. The aluminum alloy body and axial plunger design help maintain steady pressure under load while the thermal relief valve reduces heat-related stress on internal seals.

• Maximum working pressure: 3400 PSI for tougher grime removal.
• Flow rate: 2.5 gallons per minute for efficient rinsing and detergent dispersal.
• Durable aluminum housing for wear resistance and extended seal life.
• Built-in thermal relief protects the pump during prolonged use.

What comes in the package and how easy is installation?

The pump ships with essential mounting hardware and a detergent hose so you can install and test quickly. Basic mechanical skills and common hand tools are usually sufficient to replace an existing horizontal pump; adapters may be required if your current fittings differ.

• Included: 1 pump, 1 detergent hose, 2 shaft keys, 4 bolts and 4 flat pads.
• Shaft keys sized 4.78 x 4.78 x 35/42 for secure coupling to the engine shaft.
• If your pressure washer uses different hose connectors, purchase the appropriate adapter coupler separately.
• Installation tip: confirm shaft alignment and torque bolts to avoid leaks and vibration.

Are there limitations or precautions I should know?

This pump is intended for cold-water applications only and should not be used with hot water systems. Proper hoses, fittings and routine maintenance (oil checks if applicable, inspecting seals and fittings) will extend service life and ensure safe operation.

• Cold-water use only — do not connect to hot water sources.
• Not compatible with vertical or non-3/4" shafts.
• Use recommended pressure washer hoses and M22 fittings to avoid leaks.
• Follow engine and pump manufacturer guidance for mounting and break-in.

Who is this for: The Biswing 3/4" shaft horizontal axial plunger pump is intended for homeowners, rental operators and small contractors who need a reliable cold-water replacement pump for common gas pressure washers. Choose this unit if your machine matches the shaft size and engine range and you want a durable aluminum-body pump with straightforward hookup and a basic accessory kit for quick installation.