A Rotaflow Stopcock is laboratory equipment used for controlling the flow of liquids. It is a type of valve mechanism that consists of a rotating knob, which allows for smooth and easy flow control. The stopcock is typically made of materials such as PTFE (Polytetrafluoroethylene) or other engineering plastics that have low friction and high chemical resistance.

The Rotaflow stopcock is used in chemical, biological, and pharmaceutical 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 rotating knob design of the stopcock allows for precise control of the flow of liquid, making it ideal for applications that require accurate dispensing.