You are buying a Browning vacuum pump to extract the air from pellets, great for turning expander pellets into 'hookers' or 'slow sinkers', and it can also be used for drawing flavour into pellets.
Simply put pellets and water into the container, close the lid and expel the air from the container with the pump plunger. Then press the valve on the lid and allow the air back in, the pellets are now ready and the lid can be removed.
Gone are the days when it took and eternity for pellets to be ready to use. With the Browning pellet pump, it takes literally seconds for floating, hard pellets to be saturated with water and become soft and pliable