| 摘要 |
A stopper is provided for a test tube, and the like, which can be quickly inserted into the mouth of the test tube into sealing engagement therewith by a simple pushing operation, and which can be just as quickly removed by a simple pulling operation. The stopper has a hat-like configuration. It is formed of rubber, or equivalent resilient material. The stopper is placed over the mouth of the test tube and is pushed inwardly until it assumes an inside-out configuration in which the stopper is firmly sealed to the mouth of the test tube. To remove the stopper, it is merely necessary to pull it back to its original configuration.
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