Abstract: A tent has a two-ply door having an air venting fabric as a first ply and a waterproof fabric as a second ply. On the waterproof fabric, a continuous zipper which defines a c-shaped arcuate path is formed. The zipper starts at a side of the tent door and ends at the same side. Zipper slides are mounted on the zipper path, such that a pair of consecutively positioned zipper slides unzips the waterproof fabric to allow ventilation through the air venting fabric when the pair slides towards one another and zips the waterproof fabric to close off ventilation when the pair slides away from each other. Operation of a first of the pair provides ventilation through the top of the air venting fabric and operation of the other provides ventilation through the bottom of the air venting fabric.

Abstract: A sealing element located on corresponding openings of adjacent components which are rigid with respect to one another. The openings of the component terminate in sealing surfaces which are located opposite to one another and spaced from one another. A sealing ring, radially outwardly opened, is provided with a trapezoidal internal contour. The sealing ring is located between the sealing surfaces of the two components and cooperates with such components. The sealing ring is centered on a centering bead on an inside diameter of one of the components and a spreading element is located between inner leg surfaces of the trapezoidal internal contour of the ring for spreading the outer surfaces of the ring against the sealing surfaces of the component.