Spiral acoustic pipe Convenient operation, sealing is extremely good, strong resistance torque force railroad cars/containers, extremely strong, shock resistant, no leakage, no deformation, no blocking tube. Features: convenient,economy,safety spiral acoustic pipe simple connection, the acoustic pipe without the on-site welding, the spiral connection, spiral drive double buckle, locked tight sealing ring, dent weeks to end seal, effectively prevent, become loose, leakage, convenient and quick safe, reliable, and reduce the cost. Install each joint only less than a minute, greatly saves time and without any technical support. Do not need to site outside of the preparatory work, does not need any equipment, simple and quick than the traditional method. Spiral Acoustic Pipe 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