Stealth 5.5 GPM 3500 PSI Belt Drive Pressure Washer Skid – Honda GX390 & Mazzoni Pump

Stealth Operator Series 5.5 GPM 3500 PSI Belt Drive Pressure Washer Skid – Honda GX390 & Italian-Made Mazzoni Pump

The Stealth Operator Series 5.5 GPM 3500 PSI Belt Drive Pressure Washer Skid was designed for contractors who want the durability, serviceability, and water-handling advantages of a true commercial belt-drive system without stepping into the size and cost of larger high-flow platforms. Delivering an ideal balance of pressure, flow, efficiency, and portability, this machine is equally at home on service trucks, trailer rigs, flatbeds, and compact mobile cleaning systems.

Powered by the proven Honda GX390 commercial engine and paired with an authentic Italian-manufactured Mazzoni MMD21250R triplex plunger pump, this system delivers the performance required for residential cleaning, commercial property maintenance, fleet washing, equipment cleaning, building exteriors, flatwork, and surface cleaning applications. The belt-drive design reduces pump speed, heat, vibration, and wear while significantly improving water-drawing capability from buffer tanks.

The Operator Series was developed for contractors who are ready to move beyond direct-drive machines and into a platform built for daily commercial use. At 5.5 GPM and 3500 PSI, this skid provides the flow and pressure needed to efficiently operate a 20-inch surface cleaner while remaining compact enough for truck beds, trailers, and service vehicles where space and payload matter.

Built on Stealth's latest 6061-T6 structural aluminum skid platform, the system combines corrosion resistance, reduced weight, integrated anti-vibration feet, simplified maintenance, and professional appearance into a package designed for long-term ownership. The result is a pressure washer skid that delivers commercial-grade performance today while providing the flexibility to grow alongside your business tomorrow.

Frequently Asked Questions

What is a 5.5 GPM 3500 PSI pressure washer used for?

A 5.5 GPM 3500 PSI pressure washer is commonly used for concrete cleaning, commercial property maintenance, fleet washing, equipment cleaning, building exteriors, and professional pressure washing applications.

Can this pressure washer run a surface cleaner?

Yes. The combination of 5.5 GPM and 3500 PSI provides sufficient flow and pressure to efficiently operate a 20-inch surface cleaner.

Can this pressure washer pull water from a buffer tank?

Yes. The machine includes a 1" hose barb inlet connection and utilizes a belt-drive configuration designed to improve water-drawing capability from buffer tanks and auxiliary water supplies.

Why do contractors prefer Italian-made pressure washer pumps?

Italian manufacturers have long been recognized throughout the pressure washing industry for producing commercial-grade triplex plunger pumps focused on durability, serviceability, and long-term reliability.

What makes the Mazzoni pump different?

The Mazzoni MMD21250R incorporates extra-thick ceramic pistons, forged brass construction, oversized water passages, tapered roller bearings, alloy connecting rods, and a double gasket sealing system designed for commercial-duty operation.

What is the purpose of the thermal relief valve?

The thermal relief valve helps protect the pump by releasing overheated water during extended bypass operation before excessive temperatures can damage internal pump components.

What is the benefit of the VRT3-310EZ unloader?

The VRT3-310EZ provides smooth pressure regulation while the EZ Start design helps reduce startup resistance and engine load during startup.

Who is this pressure washer designed for?

This machine is designed for professional pressure washing contractors, property maintenance companies, fleet washers, and commercial cleaning operators seeking a compact commercial belt-drive platform.

What makes the Stealth Operator Series different?

Operator Series machines are designed to provide commercial-grade belt-drive performance, premium aluminum skid construction, simplified maintenance features, and mobile cleaning flexibility in a compact professional package.

Honda GX390 Commercial Engine

The Honda GX390 is one of the most trusted commercial engines in the pressure washing industry, delivering reliable power, easy starting, and proven durability for professional cleaning applications.

Italian-Made Mazzoni MMD21250R Pump

Manufactured in Italy, the Mazzoni MMD21250R is built around the engineering principles that have made Italian triplex plunger pumps the industry benchmark. Featuring extra-thick ceramic pistons, forged brass construction, oversized water passages, tapered roller bearings, alloy connecting rods, and a double gasket sealing system, the pump is engineered for smooth operation and long-term commercial performance.

Belt Drive System

The belt-drive configuration reduces pump RPM, vibration, heat, and wear compared to direct-drive systems. Lower operating speeds help extend pump life while improving water-drawing capability from buffer tanks, making belt drive the preferred configuration for professional trailer and truck-mounted systems.

VRT3-310EZ Trapped Pressure Unloader with EZ Start

Equipped with a commercial-grade VRT3-310EZ trapped pressure unloader rated up to 4500 PSI and 10.5 GPM. The EZ Start design helps reduce startup load while providing smooth pressure regulation and consistent cleaning performance.

Pre-Plumbed 1" Buffer Tank Connection

The pump inlet comes equipped with a 1/2" hose barb connection for quick and easy connection to a buffer tank or auxiliary water supply. Combined with the belt-drive system, this setup is designed to provide smooth and reliable water delivery.

Thermal Relief Valve Protection

The included thermal relief valve helps protect the pump during bypass operation by releasing overheated water before excessive temperatures can damage internal components.

Premium Stealth 6061-T6 Aluminum Skid

Constructed from structural-grade 6061-T6 aluminum, the Stealth skid platform provides exceptional corrosion resistance while reducing overall system weight.

Integrated Anti-Vibration Feet

Built-in anti-vibration feet help isolate machine vibration from mounting surfaces, reducing stress on the skid, vehicle, and supporting equipment.

Engine & Pump Oil Drain Lines

Pre-installed drain lines simplify routine maintenance and allow for faster, cleaner oil changes.

Compact Commercial Performance

The combination of 5.5 GPM flow and 3500 PSI pressure provides an excellent balance of cleaning power, efficiency, portability, and fuel economy.

Built for Mobile Cleaning Operations

Ideal for pressure washing trailers, service trucks, flatbeds, enclosed trailers, and custom mobile cleaning systems.

Scalable Business Platform

As cleaning demands increase, multiple 5.5 GPM systems can be incorporated into larger truck and trailer builds, allowing contractors to increase production capacity while leveraging equipment they already own.

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