Patent attributes
Protected stopper for test-tubes, including a substantially cylindrically extending elastomer inner body arrangeable to close a test-tube including a sealing portion formed to be inserted inside the mouth of the test-tube and a collar piece connected above the sealing portion and projecting radially with respect to the latter to receive, in bearing contact therewith, the mouth of said test-tube. The stopper includes a substantially cylindrical cover, closed at the top and mounted to cover the inner body. An engaging mechanism for simultaneously securing the inner body to the cover and the stopper to the test-tube are included, consisting of a plurality of projections extending on the inside of the side wall of the cover, coming into contact with the outer wall of the test-tube and spaced from the closing wall of the cover to form a contact step capable of constraining the projecting collar piece of the inner body.
