outside air can stream into the supply container 6 through the path mentioned above the temporary storage device 8 particularly its upper flange 9 is connected to the support structure 3 for example via an additional screw coupling not described in more detail the upper flange 9 similar to the lower flange 10 essentially has a plate shaped form in the center of both flanges an opening is present which leads to a hollow cylinder shaped prolonged extension in each the prolonged extension of the upper flange 9 is connected to the supporting structure 3 on its outside through the screw coupling already cited for example the inlet bushing 46 is arranged on the inside of the prolonged extension and sealed by means of an inlet bushing seal 47 opposite the upper flange 9 an additional seal 55 arranged between the supporting structure 3 and the supply container 6 provides for the sealed closing of the supply container 6 on the supporting structure 3 the previously cited hollow cylinder shaped viewing glass 11 is let into a groove of the plate shaped upper flange 9 the lower flange 10 closes with the lower interface of this viewing glass with a groove essentially the same the previously cited end sleeve 13 for example is similarly screwed onto the previously.