Sealing device for a filler pipe of a tank

Means (21) for sealing a pipe (13) for filling a motor vehicle tank, the device (21) comprising a seal (25) flexible with a hole (26) for the passage of the mouthpiece dispensing nozzle, and a sleeve (27) open cell foam attached to the seal (25), this sleeve (27) comprising an orifice (28) coaxial with the hole (26).