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Priority to ES1972178485UpriorityCriticalpatent/ES178485Y/en
Publication of ES178485UpublicationCriticalpatent/ES178485U/en
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Publication of ES178485YpublicationCriticalpatent/ES178485Y/en
Improved stopper, characterized essentially by the fact that it comprises a bottom from which it extends, an outer skirt of frustoconical configuration and a cylindrical skirt, located in the central part of its inner face and forming a body with it, because said cylindrical skirt presents in its inner face threads for its attachment to the neck of an appropriate container, and because concentric to said cylindrical skirt and forming a body with the bottom, there is a cylindrical stem, provided with elastic characteristics, apt to be inserted in said neck of said container, and for preventing said rod, once coupled, the air intake inside the container. (Machine-translation by Google Translate, not legally binding)