Abstract: An apparatus for filling beverage containers under an inert-gas atmosphere. The apparatus includes a stationary filling tool (20) to which the containers (1) are moved and a device for filling the containers with inert gas prior to a beverage-filling procedure. A container engaging element (19) of the filling tool is mounted in a processing chamber (12) that is charged with inert gas and encloses the container (1) in a fill-ready position. The containers are moved through an entry sluice space (11), which can be shut off from the outside and from the processing chamber, by sluice doors (10.1, 10.2).