Single Arch Expansion Joints in India Single Arch Expansion Joints are a type of flexible connector designed to absorb movements, vibrations, and thermal expansions in piping and ducting systems. They typically consist of a single arch-shaped rubber or elastomeric bellows that can accommodate axial, lateral, angular, and torsional movements. These joints help prevent pipe buckling, fractures, and noise while compensating for misalignment and thermal expansion stresses.