US Patent 7228980 Plastic capsule for hermetically closing large bottles

The plastic capsule, especially for large-volume bottles for use in dispensers, includes an openable zone (4) which is accessible from the outside and closed by a cap (3) is externally protected by a disc (5) which is made in a single piece with the capsule. The cap (3) is peripherally connected to the openable zone by easy-break ribs (6) and also by a thin annular skin (6a) which hermetically closes an annular space existing between the upper surface (1a) of the capsule and the disc (5).