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Explanation: a guess, and there may be a more specific term. From a Google search, 'Verbrauchsleitung' is used (practically) exclusively for water or gas supply lines from the mains to the consumer (subscriber or customer). Here it might be a line supplying the gas to inflate the air bag from a gas source located elsewhere.
Leitungsanlagen von Gasanlagen -
... Mit Verbrauchsleitung bezeichnet man den Leitungsteil, der gemessenes Gas
von der Zählerstelle zu der oder den Abzweigleitungen transportiert. ... www.infoseiten.de/infoservice/gasanlagen.html
Ken Cox Local time: 16:10 Native speaker of: English PRO pts in category: 251