A stopper is plug or a cork — it's designed to block the opening of a container by fitting partially inside it. The rubber plug you use to keep your bath water from going down the drain is a type of stopper. The cork in the neck of a wine bottle is a stopper . Other kinds of stoppers halt or prevent something.
A rubber stopper is a small, tapered plug used to seal the openings of test tubes, flasks and other laboratory glassware. Stoppers made of cork are also available for this purpose. However, rubber stoppers are preferable for applications that require a tighter seal or a greater degree of chemical resistance.
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