A Rotaflow Stopcock for a Burette is laboratory equipment used for controlling the flow of liquids. A burette is a long, graduated glass or plastic tube with a valve or stopcock for controlling the flow of liquid. The Rotaflow stopcock is a type of valve mechanism that can be attached to the burette to control the flow of liquid.

The stopcock 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 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 in chemical, biological, and pharmaceutical experiments.