Metal to metal sealing Applicable for various ranges of pressure and tempters. MON.DIA: 8A-50A Length: 300mm-5000mm Material of fitting: carbon steel, stainless steel Outer taper screw thread joint. Cylinder screw thread is used. Inner taper screw thread joint. Welding connection between union coupling and bellows. Client can choose the standardized joint for either end according to his needs. While ordering please specify diameter, total length, condition of use (fluid, temperature, pressure, etc) and the material and type of the joints you need.