John: The pipe/hose that you are interested in is item 23 in this diagram, http://12v.org/urs/ClutchPedalMasterSlaveCylinderPNs.jpg , with PN 4A0721465B. Genuine Audi Parts has them for $110 US as a "tube": http://genuineaudiparts.com/parts/index.cfm?searchText=4A0721465B&make=Audi&action=oePartSearch&siteid=214407