STIHL RB 400 DIRT BOSS® Pressure Washer - 2700 PSI, 6.5 HP Engine

StihlSKU: RB400-4790-012-4600-US

Sale price$849.99



When you need a power washer that delivers top performance and can stand up to daily use, choose the STIHL RB 400 DIRT BOSS® pressure washer. It features a powerful 196 cc (6.5 hp) engine that can output 2,700 psi of water pressure at 2.7 gallons per minute. It also features the durability STIHL products are known for, with a brass manifold pump design, stainless steel valves, and ceramic-coated pistons. There is also a cast-iron engine liner and a built-in shutdown feature when the oil level is low. The RB 400 DIRT BOSS® also features an easy start pump system and convenient detergent injector system. With its 25' no-kink flex hose, you can clean more area without having to move the machine. Finally, the pressure washer uses a wide range of optional cleaning accessories, including rotary surface cleaner, water broom, nozzle options, hose extensions, a gutter cleaner, aluminum wand extension, pivot coupler, and official STIHL cleaning agents. When you need to demolish dirt on a daily basis, the DIRT BOSS® handles the pressure with ease.


  • Easy Start Pump System - The Easy Start Pump System features a pressure relief valve, allowing users to start the unit without any back pressure from the pump. It enables quick, easy starting with no hard cord pulls.
  • Cast-Iron Liner - The high-quality cast-iron liner enhances durability and prolongs longevity, making sure the product is built to last.
  • Automatic Fuel Shut-Off Valve - This pressure washer features a combined on/off and fuel valve control. This allows the user to shut unit off and close fuel valve automatically for easy, no-mess transport.
  • Anti-Vibration System - This pressure washer features a STIHL-engineered four-point vibration isolation system. This reduces pump vibration during use for increased unit longevity.
  • Stainless Steel High Pressure & Brass Detergent Nozzles - This pressure washer includes stainless steel nozzles for use with high-pressure water and a brass nozzle for use with detergent. These premium nozzles are designed to resist corrosion and wear.
  • Two-Piece Lance & Gun Assembly - This pressure washer features an easy, convenient two-piece lance and gun assembly. The lance design is also extended for better accuracy in tall applications.
  • Easy-Access Inlet & Outlet Water Connections - Both inlet (water coming into the pump) and outlet (water going from the pump to the gun) connections are easy to access for faster setup.
  • Durable Design - Durable design built with high-quality components.


  • Power Source: Gas
  • Weight: 90 lbs.
  • Water Pressure: 2,700 psi (pounds per square inch)
  • Water Flow: 2.7 gpm (gallons per minute)
  • Cleaning Units: 7,290 (CU, calculated by multiplying PSI by GPM)
  • Hose Length: 25 ft.
  • Engine Power: 6.5 bhp (brake horsepower)
  • Fuel Capacity: 115.2 oz.
  • Displacement: 196.0 cc (cubic centimeters)

Width Weight Height Length
0 Inch 90 Pounds 0 Inch 0 Inch