Feature: The automatic switch adopts electronics theory , controlled by water current . It boosts pressure automatically when the tap is on , and turn off when the tap is off . It is used conveniently , and also saves power. Its copper pump body , copper impeller and stainless steel shaft are corrosion-resistant stainless . The whole pump is sealed well and the conveyed water won't be unhealthy total suction lift is high Flow rate is large. It starts well , switches sensitively and automatically , and produces low noise . It also is designed to be low temperature , small volume , delicate appearance and long-time using . CLG12-8 pump body is designed to be gathered with auto more convenient . The automatic switch adopts the circuitry to control , less trouble .