Features:Silent work and low working noise and stable Working performance.Suitable for aquarium, chemicals, liquids, dosing additives.The pump head designed for easy disassembly, easy to clean and maintain.It has been widely used in the field of experimental, biochemical analysis, pharmaceuticals, fine chemicals, biotechnology, pharmaceutical, products, ceramics, water treatment, environmental protection, the powder and so on.You can control the flowing direction by the positive and negative connect.Specification:D4 3*5pump tube: Inner diameter : 3mmOuter diameter : 5mmVolts:DC12VCurrent: 300mAWorking condition:0-40relative humidity 80%Flow rate: 19-100 ml/minPackage included:1 X DC 12V D4 small dosing pump 2mm/3mm peristaltic head For Lab water analytical liquid.