Micro Vacuum Pump MYP1301 3.7V

From the shop's description

This pump is able to create a vacuum, easy to integrate into your projects, and small in size to fit into the smallest of places. Specification Model: 130 pump Voltage range: DC 3V-6V Recommended Voltage: 3.7V Total length of air pump: 52.45mm Total length of fuselage: 25mm Motor diameter: 21mm Length/Diameter of air pump head: 20.1mm/21mm Outer diameter of air outlet (inlet): 3.5mm The current is 70mA at DC 3V and 100mA at DC 6V.