Radium Fuel Hanger Plumbing Kit, EVO 8-9, Stainless Filter The plumbing kits include everything required to connect directly to an aftermarket (-8AN male) fuel rail and (-6AN male) FPR for both single and dual pump configurations.  This includes a pre-made PTFE -8AN feed line from the hanger up to the engine bay and the kit re-uses the factory feed line as the regulator return line. The plumbing kits include everything required to connect directly to an aftermarket (-8AN male) fuel rail and (-6AN male) FPR for both single and dual pump configurations.  This includes a pre-made PTFE -8AN feed line from the hanger up to the engine bay and the kit re-uses the factory feed line as the regulator return line.