can be obtained in the completely driven in position of the stopper part 3 a component of force which functions to supportively hold the stopper part 3 in its driven in position it is therefore preferred as is also effected in the embodiment shown for such tear off arms 6 to be forwardly directed and therefore towards the tip of the stopper part 3 fig2 shows a stopper part 3 in which in addition spacer warts 7 are formed on the circumference in order to form the vent zone the spacer warts 7 can also be initially developed by injection molding in the form of tear off arms the stopper part 3 of the first type has a conical or frustoconical front region 8 and a substantially cylindrical region 9 adjoining said front region the cylindrical region 9 is divided into a front section which in a partially inwardly driven state cooperates with the stopper seat 5 forming the vent zone and another section which has a circumferential annular bead 10 for the complete sealing in completely inward driven state the spacer warts 7 are accordingly preferably developed in the front region of the cylindrical region 9 in addition to this the stopper part 3 adjoining the developed annular bead 10 widen 39 s out in funnel shape in an end region 11 to such an extent that it exceeds the inner diameter of the stopper seat 5 it may be mentioned that the dispenser 1 is provided in its downward directed head 12 with a dispenser mechanism such application p no 36 26 288 9 which does not constitute a prior publication a push.