Stopcock
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A stopcock is a form of valve used to control the flow of a liquid or gas. The term is not precise and is applied to many different types of valve. The only consistent attribute is that the valve is d
A single hole hollow glass stopcock held in place by vacuum
A straight bore plastic stopcock without the female joint. Note its washer and nut system for attaching to its female joint.
A T-bore glass stopcock in a three-way assembly. Two of the outlets end in plain hose adapters while the third ends in a male 14/20 ground glass joint. This stopcock is attached with an easily removed metal spring.
A double oblique bore glass three-way stopcock
Burette
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A burette is a graduated glass tube with a tap at one end, for delivering known volumes of a liquid, especially in titrations. It is a long, graduated glass tube, with a stopcock at its lower end and
Stopcock
…Schlenk lines which permit the application of inert gas and vacuum from the same stopcock. Stopcocks are often parts of laboratory glassware such as burettes, separatory funnels, Schlenk flasks, and columns used for column chromatography. The stopcock is a smooth tampered plug or rotor with a handle, which…
Black strip technique
Specification (on top of the burette)
Meniscus