The Delavan 7970-101Y-SB PowerFLO Electric Diaphragm Pump (Automatic Demand) has a 12VDC motor with three chambers. This positive displacement unit features a bypass mode, is capable of being run dry, and is self-priming. The pump polypropylene construction includes Viton valves, stainless steel fasteners, and Santoprene diaphragms, and the pressure demand switch works only when liquid flow is necessary for a balanced flow.