Compression fittings are essential components used in plumbing and gas systems to join two pipes or a pipe to a fixture. These fittings consist of three parts: the compression nut, the compression ring (also known as a ferrule), and the compression seat. When the nut is tightened, the ferrule compresses against the pipe and seat, creating a watertight or gas-tight seal without the need for soldering or welding. They are commonly used for connecting copper, plastic, or other types of tubing in both residential and industrial applications. Ideal for situations requiring easy disassembly and reconnection, compression fittings provide a reliable, leak-proof connection.