The liquid nitrogen pump is a removable attachment, which provides a simple and effective method to extract liquid nitrogen from the Dewar flask

It overcomes the disadvantage of rapid evaporation of liquid nitrogen under certain pressure. You can think of the system as a faucet, and slowly supply liquid nitrogen from 1L/min to 3L/min by adjusting the flow. The stable pressure makes the liquid nitrogen flow out of the system to operate like the water in the faucet, without splash, noise, vibration, etc

Because of the existence of valves and pressure gauges, you can control the pressure in the dewar container, which means you can control the volume of liquid nitrogen dumped. The metal hose allows you to control the liquid nitrogen jet and guide it into the container