The end key is the key that comes at the end of the travel gas burner vent, as shown in the picture, and it is the piece that is installed directly on the Korean gas tank or on the blue gas tank - by means of a switch - and it is classified as a spare part.
With frequent use in disassembling and installing the stove, and sometimes due to misuse, such as using excessive force in tightening, the valve for this switch becomes damaged, which leads to smuggling or the inability to press the valve to extract the gas. Then we need to change it to avoid infinitely greater problems. God