NorthStar NSQ Series 12V On-Demand Sprayer Diaphragm Pump - 2.2 GPM @ 70 PSI Automatically turns off when no flow is required to conserve battery power Honeywell MICRO SWITCH for enhanced durability and efficiency Unique pressure switch design slowly cycles the pump for reduced switch and motor wear Santoprene diaphragm and Viton valves for reliability and longer life Innovative smooth valve design for faster priming and longer life