Micro Peristaltic Pump DC 6V-12V Small 500 Geared Motor Adjust Dosing Liquid Water Pump Reverse Direction for Lab Ink Sampling There is two option for buyer choice. Option 1:Peristaltic Pump Option 2:Peristaltic Pump with speed and direction controller. Specification: The original silicone tube for this pump is 2.5 * 4.5mm, which is a high-quality silicone tube. We used DC12V voltage to test pumping, and although the flow rate of the pump was not large, the pressure was very strong. If the mouth of the pipe is slightly reduced by hand, the water column will spray out straight and hit the water surface with considerable force. The characteristic of a squeeze pump is that it has a small flow rate but good outlet pressure, making it suitable for pumping viscous/non viscous liquids such as ink. The peristaltic pump has a three roller structure inside. The lower half of the three rollers is a gear. The large gears on the three rollers and the small gears on the motor shaft form a reduction ratio, which is a relatively novel design. We found during the testing process that due to the lack of plastic particles at both ends of the hose and the absence of fixed connections to other accessories, the silicone hose would move during the pumping process. So when in actual use, the silicone tube should be securely connected to other accessories. The characteristic of a peristaltic pump is that it has a small flow rate but a strong conveying pressure. When the voltage is DC12V, its outlet pressure is even stronger. However, peristaltic pumps cannot be as quiet as diaphragm pumps when pumping water, as they may experience shaking. Therefore, it is recommended to fix the pump before use. Voltage: DC6V Current during pumping: 0.5 A Voltage: DC12V Current during pumping: 0.6 A Pump weight: 70 grams _x000D_