Features: and high quality. Micro-pump is mainly used for medicines, gas analysis sampling, instrumentation, and other fields. Completely maintenance-free and oil-free, does not pollute the transmission medium. Micro-pump is powered by a miniature DC motor drive, driving internal mechanical eccentric motion, causing the diaphragm to reciprocate. Compact, stable, reliable, suitable for handheld instruments, low noise, low power consumption. Especially suitable for environments with high negative pressure requirements. Compatible with 4.5-6mm tubing. Maximum outer diameter is 6.5mm. The pump chamber uses fixed volume air compression: during compression, the suction port closes and the exhaust port opens to form a slight positive pressure; during stretching, the exhaust port closes and the suction port opens to create negative pressure. Air is drawn in due to the pressure difference between the pump chamber and atmospheric pressure, then discharged through the exhaust port. Specifications: Material: Plastic + Aluminum Operating Voltage: DC 9V – 14V Rated Voltage: DC 12V Rated Current: 500mA Rated Power: 6W Suction Flow Rate: 5L/min Vacuum Degree: 65kPa Maximum Pressure: 120kPa Noise: Low noise operation