Abstract: A connecting element of thermoplastic material is provided for connection to a hollow body, such as an insert for a fuel tank. The connecting element or insert has the form of a component which lines a connection opening of the hollow body and/or forms a seat for a connection element. The connecting element is produced by press shaping a laminate of thermoplastic material, preferably one which has low permeability for hydrocarbons by including at least one barrier layer in the laminate. The press shaping is carried out between two mating platens, preferably male and female mold portions. The laminate may be formed by co-extrusion of a multi-layer preform, preferably in the shape of a tube having oppositely disposed walls, which are pressed against each other in the press shaping step.

Abstract: A fuel tank for a motor vehicle has a connecting portion which extends around an opening in the tank wall which is closed by a holding cover, with the interposition of a sealing ring. The connection between the connecting portion and the holding cover is made by a fixing means urging the holding cover towards the connecting portion. The sealing ring is disposed in a groove in the connecting portion or the holding cover and the cross-sections of the groove and the sealing ring are so selected that, in its operative position of closing the opening, the holding cover is supported directly by the end surface of the connecting portion, bearing against that end surface.