Yosoo 6v Dc DIY Dosing Pump Peristaltic Dosing Head for Aquarium/chemical Lab Analytical Water Volts:DC 6V Current:30mA Working condition:0-40 Relative humidity 80% Flow rate:20-60 ml/min Rotate speed:0.1-60 rpm Weigh: 150g Size: Driver sizex H:Dia.32 x Height 23(mm) Pump head size(x H):Dia. 54 x Height 46(mm) Installtion hole:47mm Flow direction: you can control the flow direction by the positive and negative connect Silent work Suitable for aquarium, chemicals, liquids, dosing additives