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MTM Hydro MG4000 Unloader with Microswitch - 4000 PSI

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MTM Hydro's MG4000 unloader series is a trapped pressure unloader that has universal 3/8" ports for mounting, installation, and bypass requirements. The Microswitch feature of this Unloader allows for immediate shutoff of supporting accessories such as a burner. This rapid response system mounted on your unloader allows for shutoff without waiting for another switch further down the line to catch the change in pressure. The MG400 unloader readily competes and regularly replaces competing models such as the VRT3 or Pulsar Unloaders. With its enticing price point, this Italian designed and manufactured unloader can be found across dozens of industries including Mobile Cleaning, Car Wash Installations, Mining, Auto Detailing, and many more.

  • Bypass - Two available 3/8" NPT Female ports
  • Inlet - Two available 3/8" NPT Female on side or bottom
  • Outlet - 3/8" NPT Female
  • Mounting port - 3/8" NPT Female bottom mounting port available
  • Other - 1/4" Side port located near handle for supporting accessory
  • Max - 10.5 GPM
  • Max - 195°F temp rating
  • Rating - 250V - 15A

  • Warning
    This product can expose you to chemicals, including DINP and/or DEHP which is known to the state of California to cause cancer or birth defects or other reproductive harm, go to for more information.

    The products we sell are not intended for use in potable water systems and are only for industrial non-drinking water applications.