A closure device for closing a container is provided. The closure device (10) includes a ring (28), a cover (30) and a cap (32). The ring has a top wall (34) and a flexible skirt (36) extending downwardly from the top wall. The flexible skirt includes a plurality of spaced-apart first legs (40) and a plurality of spaced-apart second legs (42) arranged in an alternating manner. Each of the first and second legs has a first end at the top wall and an opposing second end. The first legs are different from the second legs. An interior surface of each first leg has a first inwardly protruding ledge (44) between the first and second ends. Each second leg has a second inwardly protruding ledge (48) at the second end. An interior surface of each second leg has a flexible tongue (50) and a recess (52) configured to receive the flexible tongue. The tongues are adapted to retain an elastomer stopper (14).