MTM Hydro's MG4000 unloader series is a trapped pressure unloader that has universal 3/8" ports for mounting, installation, and bypass requirements. The MG400 unloader readily competes and regularly replaces competing models such as the VRT3 or Pulsar Unloaders. 280 Bar rated pressure. 40 Lpm max flow. 90°C rated water temperature. Trapped pressure valve. Brass & steel construction. Blue spring with regulator knob. 3/8"BSPF inlet. 3/8"BSPF outlet. 3/8"BSPF bypass. 1/4"BSPF gauge port