A "Ferrule" is a small, often cylindrical, metal or plastic component used in various applications to provide reinforcement, support, or sealing. Ferrules are commonly used in industries such as plumbing, electronics, automotive, and more, and they serve various purposes depending on the specific application

Ferrules can be used to create a tight seal between two components, such as in compression fittings, where they compress against a gasket or O-ring to prevent leaks.

Ferrules are often used for labeling or color-coding purposes, making it easier to identify different wires, cables, or components within a larger system.