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Interpump WS251 Sub Assembly (Part No: S400-1003), engine-mount design for Honda GX390K1QX, 15 LPM, 250 Bar, with RS500 gearbox, VRT3 unloader valve, and adjustable chemical injector.

Interpump WS251 Sub Assembly

SKU: S400-1003

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Interpump WS251 Sub Assembly (Part No: S400-1003) – 15 LPM, 250 Bar – Engine-Mount Design


The Interpump WS251 Sub Assembly is a high-performance pump system designed for demanding industrial applications and is well suited for engine mounting. Delivering 15 liters per minute (LPM) at a pressure of 250 Bar, it is powered by a 10.0hp (7.35 kW) engine. This assembly is equipped with the reliable Interpump WS251 pump and paired with the Interpump RS500 gearbox, ensuring durability and efficiency in high-pressure cleaning tasks.

Suitable for use with the Honda GX390K1QX engine, this sub-assembly comes with all the necessary components for smooth operation, including:

  • VRT3 Unloader Valve with M22 outlet for pressure control
  • Adjustable Chemical Injector for precise chemical application
  • ES1 Easy Start Valve for smooth and easy starts
  • Inlet Filter with a 3/4” hose barb inlet to ensure clean water flow

This setup is suitable for industries such as automotive, manufacturing, and construction, providing powerful and reliable pressure washing performance for heavy-duty tasks.

Key Features:

  • Pump: Interpump WS251
  • Gearbox: Interpump RS500
  • Flow Rate: 15 LPM
  • Pressure: 250 Bar
  • Power: 10.0hp (7.35 kW)
  • Unloader Valve: VRT3 with M22 outlet
  • Chemical Injector: Adjustable for accurate dosing
  • Easy Start Valve: ES1 for hassle-free starts
  • Inlet Filter: 3/4” hose barb inlet to prevent debris from entering the pump

This engine-mount pump assembly is suitable for industrial users requiring high pressure and durability, making it suitable for heavy-duty cleaning tasks.

Service kits

Interpump kits for this pump, taken from the Interpump parts list and quick kit guide. Check the model on your pump plate before ordering.

Piston20 x 50mm
Valve kitKIT1
Oil seal kitKIT2
Water seal kit (3 pistons)KIT69
Complete seal assembly (1 piston)KIT28

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