Closure for the charging hole of a liquid container

A closure for a charging hole of a liquid container having a tapping bush of an elastic material seally fitting into the charging hole and including an axial puncturing channel at which the container is adapted to be punctured by the puncturing pipe of a tapping device,

• wherein the tapping bush is sealed at a puncturing pipe and is provided with a manually operable pressure equalising valve for blocking and unblocking a pressure equalising channel between the head space of the container above the liquid level therein and atmosphere,
• wherein the pressure equalising channel extends axially through the tapping bush laterally of the puncturing channel and spaced therefrom and opens at an end face of the tapping bush laterally of, and spaced from, the puncturing channel, and that the tapping bush is provided with an integrated hinged flap which, in a downward tilted closing position, covers the end face, closes open ends of the puncturing channel and the pressure equalising channel in a splash water tight manner, and blocks the pressure equalising channel in a pressure tight manner, and which is adapted to be manually tilted up and down to unblock the pressure equalising channel more or less, thus operating the pressure equalising valve.