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A stopper is a conical closure used to seal a container, such as a bottle, tube or other conical openings, like ground glass joints or spherical joints.
A stopper has the form of a cone frustum. It is made of glass, plastic (PE, PTFE), rubber, wood (cork), cellulose fiber. Glass and plastic stoppers have a flat head, for easy grabbing, though some glass models simply have a closed glass cylinder. The glass stoppers have ground glass joint more often than not. Some plastic and rubber stoppers have holes in them, through which tubes can be inserted to inject gas in the bottle.
Stoppers can be bought from lab suppliers. Rubber and cork stoppers can be found in many hardware stores.
You can make a stopper by sculpting a rod of plastic. Rubber or cork can also be used.
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