Dolphin Amp Master Series Pumps are the industry standard in both energy efficiency and reliability. The best alternative and solution for pump replacement. Efficient, quiet and cool running pumps to line up with plumbing required by most bargain pumps offered from other manufacturers. This pump is superior by means of our high quality motors, advanced seal system and efficient impellers that increase the volume being pumped. Built to consume the lowest amount of energy per gallon pumped. Flow rates may be dialed back by a ball valve with no harm to the pump. Current draw drops as flow is reduced.