The bottle stopper for freeze drying is made of rubber-elastic material and consists of a peg (1), having an essentially cylindrical outer circumferential surface (10a, 10b), and a circular flange (2) which is integral with said circumferential surface. The peg contains a hollow space (4) which is open towards the free peg end face (3) and, via a slot (11) towards the axially outer part of the circumferential surface (10b). Projecting from the outer circumferential surface and spaced apart are three cams (14a-14c) which are constructed as elongate beads and whose axially outer boundaries are located on a common transverse plane (Q3) adjacent to the peg end face. Constructed in the axially outer circumferential surface (10b) is a circumferential groove (16), whose axially inner side wall is located in the transverse plane (Q3). The cams define a first insertion position of the stopper, in which the container is still in connection with the atmosphere via the hollow space and the slot. The groove allows use of a stopper model both for containers with a completely smooth cylindrical borehole of the bottle neck and for those which have an inwardly projecting rib at the transition from the borehole to the end surface of the neck. IMAGE
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