Abstract: A deformable sealing device for a gap between a wall opening of a building wall and a back wall of a vehicle docking at the wall opening has a flap-shaped deformable skirt for receiving loads by the back wall of the vehicle docking at the wall opening. The skirt has an upper transverse portion and two vertical strips that are arranged parallel to vertical sides of the wall opening. A cover is connected between the upper transverse portion and the building wall. The vertical strips have vertically extending outer edges with stiffened edge profiles. First guide members are connected between the stiffened edge profiles and the building wall, whereby the first guide members extend at a slant relative to the vertical. Each first guide member is a first tension spring with windings that are directly adjacent to one another.