In the case of a connection system having a housing and a nut which can be arranged on the housing, the aim is to provide a solution by means of which it is possible to prevent the nut from being released inadvertently from the housing. The configuration includes an upper baffle and a lower baffle configured and arranged within the flash tank so as to separate the liquid and gas phases of intermediate pressure refrigerant, and to convey each phase to other components in the refrigeration systems. The utility body is large enough to cover an outer surface of the vehicle that the utility body is unfolded to extend a front lateral side from the container member toward a front side of said vehicle for covering the vehicle. A silicon layer and a cap layer are sequentially formed over the substrate.