Small Dosing Peristaltic Pump Metering Pump Hose Pump Head for Aquarium Lab Aquarium Water Features:<br style="white-space:normal;"> Pump head is easy to dismantle and clean and maintain. You can control the flow direction by connection between positive electrode and negative electrode. Buckle style design: just a click, easy to take the pump head up and away, very conveniently replace pump tube and cleaning work. Snap design only with the touch of a hand pump head can be removed very easy to replace. Suitable for aquarium, chemicals, liquids, dosage of additives. <br style="white-space:normal;"> Specification:<br style="white-space:normal;"> Material: Plstic<br style="white-space:normal;"> Color: Green&nbsp;<br style="white-space:normal;"> Electricity: 80mA<br style="white-space:normal;"> Working condition: Temperature: 0 to 40 degrees; Relative humidity &lt;80%<br style="white-space:normal;"> Flow rate range: 0 to 200 ml / min<br style="white-space:normal;"> Range of rotation speed: 1 to 500 rpm<br style="white-space:normal;"> Dimensions of the drive: approx. 27.6 x 37.9mm (diameter / H)<br style="white-space:normal;"> Dimensions of the head of the pump: approx. 31.7 x 20.1 mm (diameter/H).<br style="white-space:normal;"> The diameter of the tube: internal diameter: 2 mm; outer diameter: 4 mm.<br style="white-space:normal;"> <br style="white-space:normal;"> Package List:<br style="white-space:normal;"> 1 * Dosing Peristaltic Pump Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.