Which tool is specifically used to expand the diameter of soft copper tubing?

The swaging tool is specifically designed to expand the diameter of soft copper tubing. It works by inserting the tube into the tool and then applying force, which shapes the end of the tube to a larger diameter. This is particularly useful for creating connections with other fittings or components, allowing for a secure and leak-free joint without the need for additional parts.

Other tools mentioned serve different purposes: a cutting tool is used for cleanly cutting tubing to a desired length, a crimping tool is used to create a connection by deforming fittings onto tubing, and a bending tool is utilized to make precise bends in the tubing to fit into a specific layout. Each of these tools is essential for different tasks in refrigeration and plumbing, but only the swaging tool is specifically intended for expanding the diameter of soft copper tubing.