openings 6 the ground pin 8 extends from the upper side of the inner region 3 a at least as far as the grounding strip the grounding strip 7 is overmoulded within the plastic layer of the inner region 3 a it extends from the ground pin 8 to the rim of the cover 3 there it follows the design which in this case is step shaped and extends upwards in the plastic and emerges at the surface in region 7 b in region 7 b the grounding strip 7 is overmoulded only on one side as it extends over the surface of the flange region 3 b this results in the grounding strip 7 extending over its entire extent in a region 7 a in which it is overmoulded on both sides and is mounted on the surface only in the region of the outer flange region 3 b in which it needs to come into contact with the closure part the installation of the cover 3 in the fuel tank 1 is further indicated in fig3 the container 11 of the fuel tank 1 has a receptacle 9 this receptacle 9 may either be impressed in the material or applied in some other way e g by being welded on the cover 3 rests against the receptacle 9 and is connected to the container 11 by way of a suitable receiving ring 10 it is possible here to use a screwed receiving ring 10 or to configure the receptacle 9 and the receiving ring 10 in such a way that.