A Gas/Air Shutoff Cock is a device commonly used in combustion systems to control the flow of gas and air. It is designed to provide a means of quickly and safely shutting off the supply of fuel in case of emergencies or maintenance requirements.
 
The primary function of a Gas/Air Shutoff Cock is to interrupt the flow of fuel and prevent it from reaching the combustion chamber. This is crucial in situations where it is necessary to stop the fuel supply to avoid accidents, such as gas leaks, fires, or equipment malfunction.
 
The size and dimensions of a Gas/Air Shutoff Cock can vary depending on the specific model and its intended application. These devices are available in a range of sizes to accommodate different pipe diameters and flow rates.
 
Typically, Gas/Air Shutoff Cocks are designed to match the pipe size of the fuel line they are installed in. Common sizes for residential and commercial applications include 1/2 inch, 3/4 inch, and 1 inch. For larger industrial systems, sizes can range from 1 inch up to several inches in diameter.