Model ESP is a semi-automatic priming system with a single action control valve, which simultaneously activates the entire system, ensuring fast, consistent air evacuation. Hale’s electric rotary vane-type positive displacement primer operates with 12 volt or 24 volt DC power. Control valves is single action, push-pull control and all bronze construction. The truck priming system can be mounted on pump or pump panel for remote operation. Explore our selection of fire truck parts today!