A Bunsen burner with stop cock is a laboratory apparatus used for heating and sterilizing materials in a laboratory setting. It consists of a vertical metal tube with an adjustable air vent at the bottom and a gas nozzle at the base that is connected to a gas source.

The stopcock is located at the base of the burner and is used to control the flow of gas to the burner. By turning the stopcock, the flow of gas to the burner can be regulated, allowing for precise control of the flame. This is particularly useful in experiments that require a consistent and controlled heat source.

The Bunsen burner with stopcock is commonly used in chemistry and biology experiments to heat and sterilize materials, such as test tubes and flasks. It is also used in microbiology experiments to sterilize inoculating loops and needles.