AR ANNOVI REVERBERI pressure washer replacement pump — Right-hand 2,800 PSI 2.5 GPM with EZ Start

AR ANNOVI REVERBERI RMW25G28-EZ is a right-handed triplex plunger pump rated at 2,800 PSI and 2.5 GPM, designed to mount directly to 7/8" vertical gas engine shafts with EZ start and thermal relief features.

This compact residential pump replaces OEM units on vertical gas-engine pressure washers and is built to deliver consistent pressure at 3,400 RPM. The die-cast aluminum body, pressed-brass pump head and swash-plate-driven pistons make it suitable for cleaning applications where a direct-coupled, durable pump is required. It arrives with a keyed hollow shaft connection, integral pressure regulation, downstream chemical injection capability, an EZ start valve and a thermal relief valve for safer operation.

How does this pump attach to my vertical gas engine?

The RMW25G28-EZ mounts directly to the engine by sliding its keyed hollow 7/8" shaft over the engine output shaft and securing at the flange. This makes it a straightforward swap for many 4–7 HP vertical gas engines commonly used on consumer carts and OEM units.

• 7/8" keyed hollow shaft fits most vertical gas engines
• Flange mounting for direct coupling—no belt or gearbox needed
• Compatible with many OEM carts designed for vertical shaft motors

What performance can I expect from this pump?

This model delivers up to 2.5 gallons per minute and a maximum working pressure of 2,800 PSI when spinning at 3,400 RPM. Its three-piston alternating volumetric design provides a steady flow suitable for typical residential and light-commercial cleaning tasks.

• Flow: 2.5 GPM (9.5 L/min)
• Peak pressure: 2,800 PSI (193 bar)
• Rated speed: 3,400 RPM for optimal output

What built-in controls and protections are included?

The pump includes integrated components to protect equipment and simplify operation, such as an adjustable pressure control valve and a thermal relief device. It also offers a downstream chemical injection port for safe detergent application and an EZ start valve to reduce starting load on the engine.

• Integral pressure control valve for stable outlet pressure
• Thermal relief valve prevents overheating and fluid damage
• Downstream chemical injection for safe detergent use
• EZ Start valve eases engine cranking under load

What are the construction and service features I should know?

The pump combines durable materials and service-forward design: a die-cast aluminum body for light weight, pressed-brass pump head for corrosion resistance, hardened steel pistons and double-gasket sealing for reliable sealing. Two bearing assemblies support the shaft and pistons to extend service life, and standard inlet/outlet fittings make plumbing simple.

• Pump head: pressed brass; pump body: die-cast aluminum alloy
• Pistons driven by swash-plate, hardened steel components
• Double-gasket sealing and two-bearing support for longevity
• Connections: 3/4" inlet, 22mm x 1.4 outlet

Who is this for? This AR ANNOVI REVERBERI RMW25G28-EZ pump is aimed at homeowners, service technicians and small-business operators replacing or upgrading vertical-shaft gas-engine pressure washer pumps. It fits users who need a compact, direct-coupled replacement with integrated pressure control, detergent injection and safety features—ideal for residential cleaning, light commercial jobs and OEM cart restoration projects.