| 摘要 |
<p>The stopper (10) has a revolution wall for delimiting a connecting end of a channel and provided with a centering extension (42) that is delimited by an internal revolution surface and an external revolution surface (SE). A portion of the external revolution surface allows centering of the connecting end of the channel with respect to an opening of a package. The internal and external surfaces converge toward each other opposite to a free end of the channel. The internal and external surfaces delimit the centering extension for forming internal and external spherical. An independent claim is also included for a package.</p> |
