Dilatation Expansion joints are the interconnection elements that ensure uninterrupted and efficient operation of the installation in the joints of buildings with different foundations (Dilatation), by absorbing strain and rupture that can occur in the pipelines due to building collapses or earthquakes, and lateral deviations. These types of expansion joints consisting of double bellows can be fixed to the desired expansion amounts by using limit rods. They can be used at all dilatation points in building passages.