General Pump - Interpump


General Pump K3 Soft Unloader up to 6gpm 1500psi


General Pump / Interpump K3 / (ZK3 GP) flow activated unloader valve.

1500psi Maximum Rated Pressure

  • 3/8" Inlet / Outlet
  • 3/4" Male Bypass with 1/2" Female inner thread
  • 165°F max temperature

Models Available:

  • Z-K3.0 - 2 to 3gpm
  • Z-K3.1 - 3 to 4.2gpm
  • Z-K3.2 - 4.2 to 5.5gpm
  • Z-K3.3 - 5.0 to 6.0gpm

Always choose the best match for your pump GPM. As a rule, if there is any question on which unloader to select in border line cases, select the lower GPM rating of the two.


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.