Mi-T-M WP-4200-0MHB Gasoline Pressure Washer – 4200 PSI, 3.4 GPM, Honda GX390

WP-4200-0MHB Gas Pressure Washer — Work Pro 4200 PSI with Honda GX390

The Mi-T-M Work Pro WP-4200-0MHB is the highest-output model in the Work Pro direct-drive line, producing 4,200 PSI at 3.4 GPM — 14,280 cleaning units — driven by a 389cc Honda GX390 OHV engine and a Mi-T-M crankshaft pump. The GX390 is Honda's heavy-duty commercial single-cylinder, common in concrete saws, construction compactors, and high-flow pumps — it carries the output headroom needed to sustain 14,000+ CU output through surface cleaners and extended cleaning runs. Cold water only.

WP-4200-0MHB High-Output Cleaning Configuration

At 14,280 cleaning units, this unit is 87% more productive than the 7,680 CU WP-3200 — the difference registers immediately on large concrete areas, fleet vehicles, and heavy equipment where throughput is the productivity constraint.

• 4,200 PSI at 3.4 GPM (14,280 CU) — sufficient for concrete stripping, rust removal, fleet washing, and structural steel cleaning at commercial throughput rates
• 389cc Honda GX390 OHV engine — Honda's commercial heavy-duty single-cylinder with 11.7 ft-lbs torque; wide service network and GX-series parts availability
• Mi-T-M crankshaft pump with brass manifold — commercial-duty triplex design; thermal relief valve, in-line water strainer, and Pressure Relief Start standard
• Adjustable pressure unloader — scale pressure down for vehicle washing without nozzle changes
• 50-foot × 3/8-inch wire-braided hose — reaches across standard truck wash bays and equipment storage areas without repositioning
• 10-inch flat-free tires, 40-inch powder-coated steel frame — stable on job site surfaces; resists corrosion for outdoor storage

WP-4200-0MHB Applications and Environments

Fleet maintenance shops washing Class 8 semi-trucks and tanker trailers find the 14,280 CU output reduces wash time versus lower-output machines. Concrete contractors use it for cured form release removal and slab preparation where 3,600 PSI works too slowly on mineral-bond residue. Agricultural operations cleaning grain combines, planters, and applicator booms need the GPM to move heavy soil load. Property restoration contractors running post-storm mud and debris removal from parking structures and building exteriors get meaningful coverage at 3.4 GPM. The 142 lb weight requires two-person handling for trailer loading.

WP-4200-0MHB GPM, PSI, and Nozzle Configuration

Rated at 3.4 GPM at 4,200 PSI (14,280 cleaning units) at rated flow. Includes 15°, 25°, and detergent quick-connect nozzles; 50-foot × 3/8-inch wire-braided hose; 36-inch two-piece lance with trigger gun. Cold water only. 49-state Honda GX390 — not for sale in California.

Specifications

Documents

Spec Sheet
Manual