At present time, we most often do gas distribution systems (the piping in flats) using copper pipes connected by pressing, we use hydraulic pressing pliers, which always guarantee the same pressure applied to the fitting (as distinct from pneumatic ones) at the point of the O-ring, thus ensuring tightness of the joint. We also bind copper pipes with hard soldering. Solder containing silver is used for gas pipes.
The connecting gas pipe (gas connection) - a device meant for connecting a customer gas installation to the gas mains. It starts with the connection to the mains and ends with the main gas shut-off valve.