| 摘要 |
A plug (2) for sealing a filler neck (1) of a fuel tank has a cap (3) which is dismountably attached to the end (5) of the filler neck using a thread (4) or bayonet, and a seal (6) whose sealing surface (7) faces a counter-sealing surface (8) of the filler neck, whereby a ring-shaped molding (9) is provided between the sealing surface and the counter-sealing surface. In order to minimize the amount of permeation, a sealing ring (10) outside of the molding (9) is provided, the sealing ring being made of an elastomer with high resistance to permeation, and the sealing surface (7) and the counter-sealing surface (8) create a narrow gap (20) on the sealing ring (10) side facing the molding (9), this gap extending to the sealing ring (10).
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