The EF5500 Everflo 12V Diaphragm Pump features a polypropylene valve plate and pump housing, a Santoprene diaphragm, and Viton valves. The versatile and lightweight unit is perfect for use as an agricultural sprayer, spot sprayer for homeowners, or fluid transfer applications. A flow demand switch turns the pump on and off automatically as needed, eliminating the need for a pressure regulator.