Performance characteristics: 1. Small size, light weight, good elasticity, convenient installation and maintenance. 2. during installation, lateral, axial and angular displacement can be generated, which is not limited by the misalignment of pipes and the non parallelism of flanges. 3. It can reduce the transmission noise of the structure and has strong vibration absorption capacity. According to different materials, it can be made into various varieties, such as acid resistance, alkali resistance, corrosion resistance, oil resistance, high temperature resistance, low temperature resistance, wear resistance, etc., to adapt to a variety of media and environments.