A Glass Key Stopcock is laboratory equipment used for controlling the flow of liquids. It consists of a glass body with a valve mechanism and a handle, which is turned to open or close the valve. The handle is usually shaped like a key, hence the name “glass key stopcock”.

The glass body and valve mechanism are typically made of borosilicate glass, which is known for its resistance to heat, chemical attack, and thermal shock. The glass key stopcock is commonly used in chemistry, biology, and other scientific experiments to control the flow of liquids in glass tubes, flasks, and other glassware.

It provides a leak-proof seal and is easy to clean and maintain. The glass construction of the stopcock makes it ideal for use in applications where the contents of the glassware need to be observed.