Filling device for a Narkosemitteldosierer

A filling device for a Narkosemitteldosierer is to be improved in such a way that the closure element (3) can be easily inserted into the filler neck (2) and away from it again. To achieve the object, a bayonet lock between the closure element (3) and the filler neck (2) in combination with a compressible by the axial rotation of the ring seal (18) is provided which has an elastically deformable spring element.