Features: and high quality Micro-pump is mainly used for medicines, gas analysis sampling, and instrumentation. Completely maintenance-free, oil-free design prevents contamination of the transmission medium. Powered by a miniature DC motor, the micro-pump drives internal mechanical eccentric motion, causing the diaphragm to reciprocate. Compact, stable, and reliable; ideal for handheld instruments. Features low noise and low power consumption. Suitable for applications requiring high negative pressure. Compatible with 4.5–6mm tubing. Maximum outer diameter of tubing is 6.5mm. Operates by fixed-volume air compression in the pump chamber: during compression, the suction port closes and the exhaust port opens to create slight positive pressure; during expansion, the exhaust port closes and the suction port opens to create negative pressure. Air is drawn in due to atmospheric pressure difference, then expelled through the exhaust port. Specifications: Material: Plastic + Aluminum Operating Voltage: DC 9V – 14V Rated Voltage: DC 12V Current Rating: 500mA Power Rating: 6W Suction Capacity: 5L/min Vacuum Degree: 65kPa Maximum Pressure: 120kPa Noise: Low noise operation