Metallic bellowsA type of tubing with a regular wavy shape, commonly usedMetallic bellowsCarbon steel, stainless steel, steel-lined plastic, aluminum, and more. Primarily used for connecting pipes where a very small bending radius is required for non-coaxial axial transmission, irregular turns, or expansion/contraction, or to absorb thermal deformation of pipes, or in situations where fixed elbows are not convenient for installation, or for connecting pipes to equipment.