A Rotaflow Stopcock for an Automatic Burette is a laboratory equipment used for the precise dispensing of liquids. An automatic burette is a type of burette that uses a motorized mechanism to control the flow of liquid, allowing for highly accurate and reproducible dispensing.

The Rotaflow stopcock is a type of valve mechanism that can be attached to the burette to control the flow of liquid. The stopcock is designed with a rotating knob, which allows for smooth and easy flow control. The Rotaflow stopcock is typically made of materials such as PTFE (Polytetrafluoroethylene) or other engineering plastics that have low friction and high chemical resistance.

The combination of the automatic burette and the Rotaflow stopcock provides a highly precise and efficient way of dispensing liquids in chemical, biological, and pharmaceutical experiments.