The product is composed of rubber double ball vulcanized and metal parallel flexible joint with inner layer, reinforcement layer and outer rubber layer composite model.It is characterized by high pressure resistance, good elasticity, large displacement and deformation, good shock absorption and noise reduction effect, flexible installation, and long applicable life. It can be widely used in hotel, factory, residential water heating pipe system and circulation pipe system, sanitary pipe, chemical anticorrosion pipe and freezing pipe, etc.