A tube expander is used to:

A tube expander is a tool designed primarily for modifying the ends of tubing to facilitate a better fit when connecting pipes in refrigeration systems. Specifically, it serves the purpose of enlarging (expanding) the diameter of a tube so that it can be fitted over or into another component, such as a fitting or connector. Additionally, it can flare the end of the tube, which enhances the sealing capabilities and helps prevent leaks at the joints.

In the context of refrigeration systems, achieving a proper seal between tubes is crucial, especially when dealing with refrigerants under pressure. The ability of a tube expander to both expand and flare the tube means it can create not only a tight fit but also a secure, leak-proof connection.

While other options relate to different functionalities that may be associated with tubes, they do not pertain to the primary role of a tube expander. For example, "bead the tube" refers to a different process and is not the main function of this tool. Similarly, breaking loose scale indoors or outdoors involves different techniques altogether, such as chemical cleaning or mechanical scraping, which do not relate to the function of expanding or flaring tubing.

Thus, the most accurate description of what a tube expander does is expanding and fl