A floating connection assembly of a bulk-head to at least one element of constraint, the bulkhead having a first face delimited by edges (10b, 10c, 10d); said assembly comprising: - a protrusion, integral to the element of constraint; - at least one first longitudinal sealing bead; - at least one projecting element, projecting from the bulkhead or from the protrusion - at least a second flexible seal; and - at least one closure plate; wherein: - the bulkhead and the element of constraint are mutually separated by a separation distance (h) along an edge of the bulkhead, in such a way that the bulkhead and the constraint element are connected only indirectly, by means of said floating assembly; - said protrusion has a second face and a third face parallel and opposite to each other, said second face being parallel and spaced apart with respect to the first face of the bulkhead; - the first longitudinal sealing bead is interposed between the first face of the bulkhead and the second face of the protrusion; - the protrusion or the bulkhead comprises at least one through hole, obtained on the second face of said protrusion or on the first face of the bulkhead; - the at least one closure plate is concentric with respect to said through hole, and it is parallel and spaced apart with respect to the third face of the protrusion or to the bulkhead; - the second flexible seal is interposed between the closure plate and the third face of the protrusion or between the closure plate and the bulkhead; - the at least one projecting element protrudes from the first face of the bulkhead or from the second face of said protrusion, is axially inserted in a respective through hole, and is integral with a respective closure plate, so that the bulkhead remains cantilevered on said protrusion, avoiding a different support; and - the projecting element has a diameter smaller than the diameter of the respective hole, so that said projecting element is freely floatable inside the through hole in the radial direction. - a protrusion, integral to the element of constraint; - at least one first longitudinal sealing bead; - at least one projecting element, projecting from the bulkhead or from the protrusion - at least a second flexible seal; and - at least one closure plate; - the bulkhead and the element of constraint are mutually separated by a separation distance (h) along an edge of the bulkhead, in such a way that the bulkhead and the constraint element are connected only indirectly, by means of said floating assembly; - said protrusion has a second face and a third face parallel and opposite to each other, said second face being parallel and spaced apart with respect to the first face of the bulkhead; - the first longitudinal sealing bead is interposed between the first face of the bulkhead and the second face of the protrusion; - the protrusion or the bulkhead comprises at least one through hole, obtained on the second face of said protrusion or on the first face of the bulkhead; - the at least one closure plate is concentric with respect to said through hole, and it is parallel and spaced apart with respect to the third face of the protrusion or to the bulkhead; - the second flexible seal is interposed between the closure plate and the third face of the protrusion or between the closure plate and the bulkhead; - the at least one projecting element protrudes from the first face of the bulkhead or from the second face of said protrusion, is axially inserted in a respective through hole, and is integral with a respective closure plate, so that the bulkhead remains cantilevered on said protrusion, avoiding a different support; and - the projecting element has a diameter smaller than the diameter of the respective hole, so that said projecting element is freely floatable inside the through hole in the radial direction.