Features: _x000D_ The pump head is of simple disassembly type for easy cleaning and maintenance _x000D_ Flow direction: you can control the flow direction by the positive and negative connect. _x000D_ No valves and seals for convenient hose replacement _x000D_ These Small Dosing Pump have the function of Self-priming _x000D_ Widely used in the field of experimental, biochemical analysis, pharmaceuticals, fine chemicals, biotechnology _x000D_ _x000D_ Specification: _x000D_ Applicable power supply: DC6V/12V/24V(Optional) _x000D_ Working environment: temperature 0 to 40, relative humidity of < 80% _x000D_ Medium flow direction: the flow direction of peristaltic pump depends on the positive and negative connection of power supply _x000D_ Flow range: 0-150ml/min(without speed regulating circuit) _x000D_ Motor size: diameter 27.5mm, height 50(mm) _x000D_ Pump head size: diameter 31.7mm,height 20.1(mm) _x000D_ Standard pump pipe: inner diameter 2 * outer diameter 4(mm) (pump pipes of different sizes can be changed according to flow requirements) _x000D_ Mounting hole spacing: 47mm _x000D_ Weight: 106 g / 3.7 oz(approx.) _x000D_ _x000D_ _x000D_ Package list: _x000D_ 1 x Peristaltic Pump _x000D_ _x000D_ _x000D_ Note:Before using acid-base medium, it is better to soak the pump pipe for 24 hours