Compression fittings are popular because they do not require soldering, so they are comparatively quick and easy to use. They require no special tools or skills to operate. They work at higher pressures and with toxic gases.
Making a compression Joint
Copper Tube can be cut with a hacksaw: a fine toothed blade is best, or use a tube cutter. Do not use too much pressure on the cutting disk.
The most common method of joining copper tube is with the use of a socket-type, copper or copper alloy capillary fitting into which the tube sections are inserted and fastened by means of a filler metal, using either a soldering or brazing process.
Capillary Solder System
Since the introduction of thin-walled copper tubes in the early eighties, this method of joining copper tubes has become the most widely used. This has been due to several factors: