Abstract: Embodiments of the present invention provide second wall hoses for use in a fuel system in order to ensure that, in the event of failure of the first internal hose, the second wall hose contains any leakage. Specific embodiments are designed for particular use on aircraft, where weight is sought to be kept as minimal as possible.

Abstract: Sealing device for the interface between an airbag and a gas generator. A flat seal (7) made of an elastomer material is fixed by stitching (9) to the piece of cloth (5), constituting an interface, which is stitched to the wall of the airbag (4). The seal (7) has a circular opening at its center, which faces the opening presented by the interface (5). The diameter of the opening (7) is less than the outside diameter of the end (1) of the gas generator and the insertion of this end (1) into the opening (7) causes the formation of a flap formed by the edge of the seal (7), which acts as a sealing lip. The invention ensures an increase in pressure in the airbag and improves the shock absorbance offered to the occupant of the vehicle.