The 22-Series Pumps are compact and designed for a wide range of applications including liquid transfer, spraying, circulation, filtration and dispensing. The 22-series of diaphragm pumps are self-priming, can be run dry without harm and have an internal bypass feature which reduces pump cycling. It provides up to 1.4 gallons per minute. This compact automatic demand water system pump has a built-in pressure switch, which automatically starts and stops the pump when faucet is opened and closed.