A closing element (28) for restricting communication of a substance through an access passage (34) of a body (24) includes a first portion (68) for being removably affixed to the body (24), the first portion (68) having an inner wall (80), an outer wall (96) surrounding the inner wall (80), and at least one bridge (100) connecting the outer wall (96) with the inner wall (80). The closing element (28) has a second portion (72) for being non-removably affixed to the body (24) and a movable connecting element (76) extending between the first portion (68) and the second portion (72). The closing element (28) has an unactuated configuration wherein a major portion (78) of the length of the connecting element (76) is located laterally between the inner wall (80) and the outer wall (96) to shield the major portion (78) of the length of the connecting element (76).