1. Cover twist off type formed by a discoidal body (1) of diameter much greater than the height, provided with a peripheral skirt (2) with adjusting means threaded mouth (3) of the pot or jar (4) to close. The cap (1) has a gap (5) characterized in that: - in which there is a hole (6) with a neck (7) around protruding inwardly where a membrane (8) Isolating food. - In this orifice (6) is a plug (9) provided with a handle stopper ring (10) and a pointed projection (11).
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