Abstract: A heat transfer apparatus is provided, comprising a fluid-tight first housing and at least one fluid-tight second housing, wherein the at least one second housing is arranged in the first housing, a fluid-tight third housing is arranged in the at least one second housing, a first medium flow is guided between the first housing and the at least one second housing, a second medium flow is guided in the third housing, the heat transfer apparatus comprises a heat storage device with a heat-conducting medium, the heat storage device is arranged between the at least one second housing and the third housing, and wherein the heat storage device is in thermal contact with the at least one second housing and the third housing.

Abstract: A sealing plug for sealing an opening in a component has a substantially annular or cylindrical shank, the shank is closed by a sealing surface, and a sealing lip is provided on the shank and having a cone-shaped configuration. The sealing lip locks in place on the rear side of the component and closes the opening. The free edge of the first sealing lip is in contact with the rear side of the component in the assembled condition. The sealing lip has at least one flexible folding zone provided thereon which is reversibly foldable such that in a folded condition of the folding zone the circumference of the sealing lip is reduced in the area of the folding zone at least one of the edge and the sealing lip.