| 摘要 |
A closure for a vial includes a head portion, and a stem portion which projects from a lower surface of the head portion, the stem portion being inserted in an opening of a vial; wherein the stem portion is provided with a small diameter portion and a seal portion, in that order from the lower surface the head portion, the diameter of the small diameter portion being smaller than the diameter of the seal portion. The entirety of the small diameter portion and the seal portion are substantially uniformly fitted in the opening of the vial.
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