Flow actuated bypass. Nominal pressure spikes for smoother operation. Provides protection for single gun, non-weep installation. Reduced pressure loss means more cleaning power. Rated to 4000 PSI. Flows from 2.5 to 10.5 GPM. Maximum temperatures to 195 F. Inlet, outlet and bypass ports are all 3/8" FPT. Available with or without 2 amp pressure switch.