What type of fittings are used to connect copper tubing in a gas system?

Compression fittings are designed specifically for joining copper tubing in gas systems. They work by using a ferrule that compresses around the tubing when the nut is tightened, creating a secure seal without the need for soldering, welding, or threading. This makes them particularly advantageous in gas installations where a strong, leak-proof connection is crucial.

Compression fittings are also relatively easy to install and can be removed and reused, making them a practical choice for technicians who may need to make adjustments to the system in the future. This convenience, along with their reliability, is why they are commonly recommended for connecting copper tubing in gas applications.

Other types of fittings, such as solder, threaded, or welded fittings, have their specific uses but do not provide the same level of ease of installation or versatility as compression fittings in gas systems. Solder fittings require heating and skill to create a joint, threaded fittings require matching threads and can be prone to leaks if not properly sealed, and welded fittings are usually not practical for the types of connections found in residential or commercial gas lines.