Automatic mixing inverters for cylinders for fire-fightings. The system consists of two independent stations which allow the cylinders to be rotated by almost 360 °. Loading and unloading are manual; it is possible to set the operating cycle parameters thanks to a touchscreen panel. The entire structure is protected by protective railings and the gates are sized to allow the passage of forklifts. A push button panel mounted on a movable rod allows the operator to carry out the loading and unloading operations while remaining mounted on the forklift.