Features: The pump head is of simple disassembly type for easy cleaning and maintenance Flow direction: you can control the flow direction by the positive and negative connect. No valves and seals for convenient hose replacement These Small Dosing Pump have the function of Self-priming Widely used in the field of experimental, biochemical analysis, pharmaceuticals, fine chemicals, biotechnology Specification: Applicable power supply: DC6V/12V/24V(Optional) Working environment: temperature 0 to 40, relative humidity of < 80% Medium flow direction: the flow direction of peristaltic pump depends on the positive and negative connection of power supply Flow range: 0-150ml/min(without speed regulating circuit) Motor size: diameter 27.5mm, height 50(mm) Pump head size: diameter 31.7mm,height 20.1(mm) Standard pump pipe: inner diameter 2 * outer diameter 4(mm) (pump pipes of different sizes can be changed according to flow requirements) Mounting hole spacing: 47mm Weight: 106 g / 3.7 oz(approx.) Package list: 1 x Peristaltic Pump Note:Before using acid-base medium, it is better to soak the pump pipe for 24 hours