It is PTFE PTFE wire threaded hose threaded hose braiding layer or multi-layer wire mesh or steel (under pressure), equipped with joints or flanges at both ends of the flexible component. It can absorb vibration, compensate for displacement, especially in the piping system has the ability to compensate for displacement. Meanwhile, with light weight, small size, fatigue resistance, good flexibility, high corrosion resistance, high pressure and so on. Applies to strong corrosive, high pressure pipe systems