sperus 2400 PSI Pressure Washer Pump — Vertical 7/8" Shaft Replacement with EZ-Start Valve, 2.2 GPM

The sperus AR RMW22G24-EZ -SX is a 2400 PSI, 2.2 GPM triplex plunger pump designed as a direct vertical 7/8" shaft replacement with an EZ-Start bypass valve for easier engine starting.

This replacement pump fits most small engine pressure washer carts and vertical-shaft gas engines in the 4–7 HP range. Built to industry dimensions and supplied with the common 7/8" shaft, the unit includes flange hardware, hose fittings, three spray tips (0°, 40°, Soap), a soap hose, and a key for straightforward installation. The integrated EZ-Start valve reduces starting resistance by diverting water during pull starts, and the pump is rated to deliver 2.2 gallons per minute at 2400 PSI when driven at approximately 3400 RPM.

How will this pump fit my pressure washer engine?

The RMW22G24-EZ -SX mounts to most vertical-shaft gas engines that use a 7/8" diameter shaft and typically fall within the 4–7 HP range. Confirm your engine shaft size and mounting pattern before ordering to ensure compatibility.

• Standard 7/8" shaft with keyway for secure slide-on installation.
• Includes flange bolts and nuts to match common OEM carts.
• Designed for engines spinning around 3400 RPM for rated flow/pressure.

What performance can I expect from this replacement head?

This triplex plunger pump produces a steady 2.2 GPM at a maximum pressure of 2400 PSI under the specified RPM. It’s engineered for residential and light commercial cleaning tasks where that flow and pressure balance effective cleaning without oversized engine demands.

• Triplex plunger design for reliable, continuous flow.
• Rated output: 2.2 GPM at 2400 PSI when operated near 3400 RPM.
• Suitable for common driveway, vehicle, and siding cleaning jobs.

What is the EZ-Start valve and how does it affect operation?

The EZ-Start valve temporarily reroutes water during engine starts so the crankshaft experiences less hydraulic resistance. This makes pull-starting easier, especially after repeated attempts, but if the valve malfunctions it can reduce system pressure in use.

• Diverts water bypass during startup to reduce starting torque.
• Improves rope-start success on older or lightly powered engines.
• Persistent low pressure may indicate valve adjustment or servicing is needed.

How simple is installation and what accessories are included?

Installation is straightforward: slide the pump onto the engine shaft, align the keyway, and secure the mounting flange with the included bolts. The pump ships with essential fittings so you won’t need to source many extras to get back to work.

• Included: flange bolts, flange nuts, key, soap hose, and three nozzle tips (0°, 40°, Soap).
• Generic 22mm x 14mm hose connections match common pressure washer hoses.
• Drop-in replacement style fits most OEM carts with minimal modification.

Who is this for: The sperus AR RMW22G24-EZ -SX pump is aimed at homeowners and light-commercial operators who need a reliable, drop-in replacement for a vertical 7/8" shaft pressure washer pump. It’s ideal if you require 2400 PSI cleaning performance, a compact triplex plunger design, and an EZ-Start feature to simplify pull-starting. If you’re matching a failed original pump or upgrading to restore factory-like pressure and flow, this unit provides the standard fittings and accessories to make installation quick and inexpensive.