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. Specifications: Model: G328 Color: Black/Green(optional) Silica Gel Tube(internal dia.outside dia.): 1mm3mm/2mm4mm/3mm5mm(optional) Motors: DC12V Flow Rate: 13 silica gel tube: >11ml/min 24 silica gel tube: >39ml/min 3*5 silica gel tube: >80ml/min Pump Head Material: ABS Pump Pipe: Transparent silicone pipe Pulsations: Three roller