Filling tube plastic, blow molding extrusion.

Tube (1) molded plastic extrusion blow, especially filling pipe for the tank of an automobile, which comprises a coextruded multilayer, and has at each end zones (7) mouthpiece having each flange and / or surfaces (8) frontal provided for welding structural components linking, characterized in that at least two zones (7) mouth located at different ends are calibrated, and that the layer (2) inside the coextrudate with reference to the cross section of the tube (1) filling, completely forms the end face (8) provided for welding, of the respective mouth region.