Patent ID: 8452167

Claim:
A urea feed or return line that comprises: a hollow coupling enabling it to be connected to a urea tank and that comprises a passage for the urea, the coupling being, in addition, equipped with a heating filament, at least one part of which extends freely inside the passage for the urea, the at least one part having the shape of a loop or a spiral capable of also extending at least partly into the urea tank and/or into a tube attached to the urea tank, said line comprising, over substantially an entire length of the line, a heating filament produced from one part with that of the coupling or a separate heating element connected in series or in parallel with that of the coupling, wherein the heating filament is coiled round the outer surface of the line, one end of the heating filament being directly connected to one post of an electrical terminal and an other end of the heating filament describing the loop inside the coupling before being connected to an other post of the electrical terminal.