Abstract: Provided is a stopper for a liquid dispensing opening of a container which includes a main cavity, the opening having a diameter d smaller than the size of the cavity. The stopper includes a body having a central axis and being provided with a first, bottom limiter configured for preventing extraction of the stopper through the liquid dispensing opening in a first direction. The bottom limiter includes an expandable arrangement configured for assuming a first, retracted position and having a diameter D2?<d allowing the bottom limiter to pass through said liquid dispensing opening and a second, expanded position having a diameter D2>d configured for preventing said extraction; the stopper also includes a second limiter configured for at least partially preventing displacement of the stopper through the liquid dispensing opening in a second direction opposite the first direction.

Abstract: Provided is a stopper for a liquid dispensing opening of a container which includes a main cavity, the opening having a diameter d smaller than the size of the cavity. The stopper includes a body having a central axis and being provided with a first, bottom limiter configured for preventing extraction of the stopper through the liquid dispensing opening in a first direction. The bottom limiter includes an expandable arrangement configured for assuming a first, retracted position and having a diameter D2?<d allowing the bottom limiter to pass through said liquid dispensing opening and a second, expanded position having a diameter D2>d configured for preventing said extraction; the stopper also includes a second limiter configured for at least partially preventing displacement of the stopper through the liquid dispensing opening in a second direction opposite the first direction.