Manual Brass Coated Aluminum Bunsen Burner, Brand Name : Medcounty

Burner Bunsen fitted with stopcock for gas control.  

Bunsen burner, is a kind of gas burner used as laboratory equipment; it produces a single open gas flame, and is used for heating, sterilization, and combustion. The gas can be natural gas (which is mainly methane) or a liquefied petroleum gas, such as propane, butane, or a mixture.
The flame can also be adjusted by using the stopcock located at the bottom of the Bunsen burner, which adjusts the flow of gas entering the Bunsen burner. The hottest part of the flame is located at the tip of the inner blue cone. Never leave an unattended flame.
The Bunsen burner consists of a metal tube on a base with a gas inlet at the lower end of the tube, which may have an adjusting valve; openings in the sides of the tube can be regulated by a collar to admit as much air as desired.
A stopcock is a form of valve used to control the flow of a liquid or gas. The term is not precise and is applied to many different types of valve. The only consistent attribute is that the valve is designed to completely stop the flow when closed fully.