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Tube end forms are required for many tubing applications. They are used to create some type of connection to another media (tube, hose, or block). In most cases, they can be formed on any style of tube, although some limitations exist, which are discussed further in this chapter. There are five basic forms that can be applied to the end of a tube: reduction, expansion, flare, bead, and impact (thickening). Brazing has been the primary method of adding an attachment to a tube.