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HM Unloader Valve 10.83gpm 3000psi

General / Interpump HM (ZKHM) unloader valve with easy start.

Maximum rated pressure: 3000psi

  • 10.8 gpm max flow
  • 165°F max temperature
  • 3/8" female inlet / male outlet
  • 1/4" Gauge port
  • 1/4" (x2) bypass

Ideal for use with gas engines. The easy start eliminates back pressure when pull starting. Mount in upright position for proper operation.

For proper operation the valve must be mounted in the upright position.


Unloader valves are one of the most important safety devices on a pressure washer system. Failure to install and set the unloader properly could result in a very dangerous situation causing severe damage to the pump and possibly the operator.

Professional installation is required.