Features:Pump head adopts buckle design without screw, which can be removed through pressing the buckles on both sides with your hands, easy to clean and maintain.Support CW and CCW: Switching power supply positive and negative pole, realize the CW and CCW of the pump head.Flow Direction: You can control the flow direction by the positive and negative connect.No valves and seals, convenient hose replacement, easy maintenance. This small dosing pump has the function of self-priming.Widely used in the field of experiment, medical, biochemical analysis, pharmaceuticals, fine chemicals, biotechnology, food, environmental protection, family, etc.