Locking cover for a container having a neck, with a cap having breakable securing tabs

A locking cover for a container having a neck, the locking cover configured to block a stopper in the neck of the container, the locking cover comprising:

• a cage comprising plastic material and configured to surround the stopper and the neck and lock the stopper and the neck axially in position relative to each other;
• a body comprising plastic material, the body fastened around the cage, the body comprising a central orifice providing access from the outside of the locking cover to the inside of the container through the stopper, and
• a cap configured to close the central orifice, the cap comprising a flat head to cover the central orifice and fastening lugs retained between the cage and the body, each fastening lug having a breakable zone;
• wherein the cap comprises a plastic material different from the plastic material of the cage and from the plastic material of the body, the plastic material of the cap exhibiting a reduced resistance to rupture responsive to a dose of gamma irradiation sufficient to sterilize the locking cover.