Metal compensators are manufactured with one or more bellows, thereby making it possible to compensate for axial and / or lateral movements, which are limited. It is possible to add lateral rods to guide or limit the direction of movement. With or without an internal baffle, the metal used for its construction will depend on the type of fluid. And it’s the pressure that will determine its thickness. The main advantages lie in their resistance to high pressures, their long life and their low maintenance. Their rigidity can be an advantage in large installations requiring multiple air supports. They thus make it possible to better guarantee and preserve the structure of the installation.