A type of device that allow you to shift your fuel mass around the airplane so it can balance out. It don't move the fuel anywhere, it move the fuel to the fuselage that you have to selected it and you have to also pick your CoM location at start on where you want it to be located. I thought up this idea because it is good if your aircraft fly on a long trip and the CoM stay the same as the start. (Help the game to make it more realistic). Thanks