Stopcock
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A stopcock is a form of valve used to control the flow of a liquid or gas.
General
A stopcock consists of an elongated conical item with a handle and a ground glass joint, always male. Most models are full glass and have a two or three way bored holes and are full glass. Other models, are hollow and have two bored holes. Stopcocks are made of borosilicate glass or PTFE.
Stopcocks are often parts of laboratory glassware such as (automatic) burettes, chromatography column, Dean-Stark apparatus, dropping funnels, Imhoff cone, Schlenk flasks/lines, separatory funnels, various adapters.
Availability
Stopcocks can be bought from lab suppliers or online.
You can also scavenge them from broken glassware, like separatory funnels.
Maintenance
Make sure stopcocks are always well greased. Teflon stopcocks do not normally require greasing.
