The product consists of imported high-quality 304 stainless steel bellows, live sleeve copper nuts, high-quality gasket. The product is not only corrosion-resistant, non-leakage, reliable sealing, and because there is no core tube and large diameter, high flow, high pressure, no burst, long service life. The tube body is flexible by solution heat treatment and surface treatment, can be bent at will and the diameter remains the same, and the connection is reliable and easy to install. The product is permanently bright as new, very rich in modern atmosphere, is the family with water heater installation, hotels, restaurants, sanitary ware installation connected with the most ideal connection. Because of the easy installation, not afraid of fire, is also the ideal flexible connection of the fire pipeline.