Aquarium Equipment -12v Peristaltic Head Dosing Pump for Aquarium Laboratory Analytical Water Green Highlights Generic Brand 12v Peristaltic Head Dosing Pump for Aquarium Laboratory Analytical Water Green Description: Buckle type design: one click, easy to use and take off, and very convenient, replace the pump hose and cleaning work. Driver Size: 27.6*37.9mm (x H); Head size: 31.7*20.1mm (x H); Fitted with Pump Tube (ID x OD): 2mm Internal Dia x 4mm Outer Dia. Flow direction: The flow direction of the peristaltic pump depends on the positive and negative connection way. Suitable for chemistry, experiment, food, plant, environmental protection, family and many other fields. Applicable power: DC12V; Working environment: temperature 0-40C, relative humidity