Features: Adopt the design without screw clasp, easy to disassemble 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 These Small Dosing Pump have the function of Self-priming Widely used in the field of experimental, biochemical analysis, pharmaceuticals, fine chemicals, biotechnology Specification: Type(Optional) : black 12v 1*3, white12v 1*3, blue12v 1*3, green 12v 1*3, black 12v 2*4, white12v 2*4, blue12v 2*4, green 12v 2*4, black 12v 3*5, white12v 3*5, blue12v 3*5, green 12v 3*5, black 24v 1*3, white 24v 1*3, blue 24v 1*3, green 24v 1*3, black 24v 2*4, white 24v 2*4 blue 24v 2*4, green 24v 2*4, black 24v 3*5, white 24v 3*5, blue 24v 3*5, green 24v 3*5 12 v motor Flow rate: 1*3 silica gel tube: > 11ml/min 2*4 silica gel tube: > 39ml/min 3*5 silica gel tube: > 80ml/min 24 v motor Flow rate : 1*3 silica gel tube: > 11ml/min 2*4 silica gel tube: > 40ml/min 3*5 silica gel tube: > 83ml/min Pump head material: ABS Pump pipe: transparent silicone pipe Pulsations: Three roller Height: 6.3cm/2.5in Weight: Approx.81g~83g/2.9oz~2.9oz Package list: 1 x Peristaltic Pump