The F42 DC 12V or 24V Booster pump is our general-duty on-demand positive displacement pump. It provides reliable performance in high water flow, moderate pressure applications. Designed by 4 stronger chambers, the pump could provide up flow from 2.0 to 5.5 GPM and is capable of self-priming up to 6 vertical feet, and can run dry without damage. Serves 3 or more 1/2” (13 mm) outlets. This automatic demand water system pump has a built-in pressure switch, which automatically starts and stops when the faucet is opened and closed. They're easy to install, service and winterize.