The Interpump HM Unloader Valve Specification:

• 3000 psi Max. Pressure

• 1.3 to 10.8 gpm Max. Flow

• 195° F Max. Temperature

• 3/8" BSP-F Inlet

• 3/8" BSP-M & 1/4" BSP-F Outlet

• 3/8" BSP-F Bypass (x2)

Per GENERAL PUMP, BSP threads can be used as NPT



Ideal for use in systems which incorporate a gasoline engine; eliminates back pressure in system when pulling a manual start engine. Features brass and stainless steel construction, and a plastic adjustable pressure control knob