A filler device or pipe comprising: a filler neck including a pouring inlet, a neck connection portion, and a connection pipe which includes a bellows part and which is connected to the neck connection portion. Fuel is injected through the pouring inlet and fed into the fuel tank through a filling passage of the filler device. The filler device further includes an inner tube including a tube body formed of a flexible elastomer material, which is inserted into the connection pipe. The tube body and the connection pipe having cooperating engaging members for holding the tube body within the connection pipe. The tube body covers an inner wall of the bellows part.