| 摘要 |
A cap for receptacles provided with an inside stopper, wherein the inside of the side-wall of the cap is threaded so as to fit on the threaded side-wall of the opening of the receptacle and the inside stopper is provided with a side-wall whose outside diameter is equal to or slightly greater than the inside diameter of the opening of the receptacle and is provided with a flange on the upper end of said side-wall and having an outside diameter smaller than the inside diameter of the cap. The inside stopper is securely attached to the cap so as to be free from slipping out therefrom.
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