Metal hose is a kind of pipe fitting for conveying various fluids with corrugated pipe as the core element. Its working nature plays a compensation role in the connection between pipelines, pipelines and equipment, and equipment and equipment. The metal hose uses its bending disturbance to make up for the position deviation caused by the installation of the pipeline system, and to bear the relative displacement required by the very work of the two disconnect points. In some pipeline systems, it also plays the role of vibration reduction and noise elimination