(57) It is threaded on the necks (C) of bottles, flasks (F) and other containers. It is
characterized in that it comprises two caplike bodies (1,2) of which one body (1)
is larger and is attached over the other body (2), which is housed inside the larger
one and is the one having the inner side surface threaded for fitting to the neck
(C) of the pertinent container (F), said bodies (1, 2) having on one of their side
contact surfaces at least one projection (3) penetrating in a peripheral slot (4)
of the other and allowing the larger body (1) to rotate about the smaller one (2),
at the same time preventing separation from the latter, which comprises externally
an upper chase (8) for manipulation, by a key (7) or convenient tool, through an upper
aperture (5) of the larger body (1). The stopper has means (10, 11) for closing the
container (F) without the need of tools (7).
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