Aerator for barrel e.g. beer barrel, has rubber bung with extension ring which expands over expansion plane, seals and then remains in resting plane

摘要

Aerator has a rubber bung (1) with an extension ring (5) which expands over a expansion plane, seals and then remains in resting plane (8). The barrier plane of the driving pin (10) firmly holds the bung rubber with extension ring, which cannot be detached, at the expansion plane and the resting plane.