It can be also called shock absorber, expansion joint, pipe shock absorber, shock throat, flexible connection; it is the flexible connection in metal pipe. The product consists of rubber sphere which with inner glue, chinlon cord fabric strengthen ring and outer glue and loose metal flange. We have brought in foreign advanced technology, because of high pressure inside, chinlon cord fabric and glue layer can connect with rubber better. Under the higher working pressure, the product processes better quality than ordinary ones. It is a kind of pipe joint with high elasticity, good sealing, high medium resistance and high climate resistance.