A higher-quality adapter.
The gas cylinder adapter is made of brass. This is done so that the thread on the valve does not wear out with frequent use (it prevents the thread from being stripped).
It can be used both for filling household cylinders and for other equipment where valves with an external left-hand thread of 21.8 mm (per GOST) are installed at the inlet.
If you have a gas cylinder or are only planning to buy one, a filling adapter for a gas cylinder is essential!

