Flange sound tube is cast steel flange docking, screw fastening, convenient and reliable, without any equipment, special tools and technology staff can installation operation; Greatly shorten the reinforcing cage erectness time, convenient and quick. Features: Convenient operation, sealing very well. Railroad cars/containers is extremely strong, strong resistance torque force, shock resistant. No leakage, deformation, blocking tube. Flange Sound Tube Specifications type of 50 type of 54 type of 57 50*1.5 54*1.5 57*1.5 50*1.6 54*1.6 57*1.6 50*1.7 54*1.7 57*1.7 50*1.8 54*1.8 57*1.8 50*1.9 54*1.9 57*1.9 50*2.0 54*2.0 57*2.0 50*2.1 54*2.1 57*2.1 50*2.2 54*2.2 57*2.2 50*2.3 54*2.3 57*2.3 50*2.4 54*2.4 57*2.4 50*2.5 54*2.5 57*2.5 50*2.6 54*2.6 57*2.6 50*2.7 54*2.7 57*2.7 50*2.8 54*2.8 57*2.8 50*2.9 54*2.9 57*2.9 50*3.0 54*3.0 57*3.0 50*3.1 54*3.1 57*3.1 50*3.2 54*3.2 57*3.2 50*3.3 54*3.3 57*3.3 50*3.4 54*3.4 57*3.4 50*3.5 54*3.5 57*3.5