Delavan 5840-201E PowerFLO Electric Diaphragm Pump (Automatic Demand)Delavan PowerFLO Electric Diaphragm Pump (Image shown may not match exactly) Model: 5840 201E 12 VDC Automatic Demand Delavan designs, engineers and manufactures a wide variety of electric pumps for many different applications. The 5840 series are 12 VDC or 115VAC and are also available in both Automatic Demand and Bypass versions. Pumps are manufactured with Viton valves and Santoprene diaphragm for increased corrosion resistance. Features: Max flow: