New, overstocked inventory, in-stock and ready to ship – surplus inventory, limited supply.

The STIHL RB 400 Dirt Boss® was built around the component choices that separate a machine designed to hold up under regular use from one that's designed to look competitive on a spec sheet at the point of sale. The brass manifold pump design with stainless steel valves and ceramic-coated pistons is the foundation — brass manifold construction resists the corrosion and cracking failures that degrade cheaper aluminum manifold pumps over time, stainless steel valves maintain consistent seat integrity under repeated pressure cycling, and ceramic-coated pistons extend bore life by resisting the abrasive wear that water and debris accelerate in standard steel piston designs. A cast-iron engine liner reinforces the 196cc STIHL engine's cylinder against the same long-term wear, and a built-in low-oil shutdown protects the engine from running dry and sustaining damage before the operator notices the oil level has dropped. ManualzzManualzz

A STIHL-engineered four-point vibration isolation system sits between the pump and the frame, reducing the cyclic vibration that loosens connections, fatigues fasteners, and shortens the service life of the pump assembly over long hours of operation. A combined on/off and fuel valve control automatically closes the fuel valve when the unit is shut off — a no-fuss feature that prevents fuel from sitting in the carb during storage and transport without requiring a separate step from the operator. The Easy2Start™ pump system reduces the force needed to pull the starter rope, and the two-piece lance and gun assembly with an extended lance design improves accuracy on tall applications like building facades and equipment. The included 25' no-kink flex hose, integrated detergent injector, and stainless steel high-pressure nozzles with a brass detergent nozzle make the RB 400 a complete, ready-to-use system out of the box, with an extensive range of optional STIHL accessories — rotary surface cleaner, water broom, gutter cleaner, hose extensions, and more — available through the dealer network to expand capability as needed. Toro + 2

• Brass Manifold Pump with Stainless Steel Valves and Ceramic-Coated Pistons — the pump is built from the materials that hold up under regular use, not just occasional cleaning: brass manifold, stainless valve seats, and ceramic piston coating all work together to extend service life well beyond what aluminum-manifold consumer pumps deliver
• Four-Point STIHL Vibration Isolation System with Cast-Iron Engine Liner — the pump is isolated from the frame at four points to absorb cyclic vibration that fatigues connections and fasteners over time, while the cast-iron cylinder liner protects the engine bore from the accelerated wear that regular pressure washer operation puts on untreated steel
• Combined Fuel Shutoff/On-Off Control with Easy2Start™ Pump and 25' No-Kink Hose — the automatic fuel shutoff prevents carburetor fouling during storage without a separate step, the Easy2Start™ system reduces pull effort at startup, and the 25' no-kink flex hose extends working range without repositioning the machine across the job site

Make: STIHL
Model: RB 400 Dirt Boss® Gas Pressure Washer
Model #: 4790-012-4600-US
Equipment #: 996368723
Location: Northern California
Condition: New