A five-liter cylinders for portable gas stoves are easy to use, but to exchange them for sometimes full and not empty. The fact that the wear of the valve stem from the old container for the consumption of the gas disrupts the gearbox. To restore the flow of gas through gaskets is a difficult and requires individual adjustment for each cylinder. However, it is to put a little pressure on top of the gear case, as the gas will go again. This is”charging” a simple clip shown in the figure.