Stock Corvette Tin Bundy Welded Fuel Lines can rust internally and, as a result, accumulate rust particles in your fuel filter. Fuel Vapor Lines return fuel vapors to the tank on non vented gas caps, thus keeping the fuel vapors from the atmosphere. TBW was original equipment on the Corvette, these stainless steel fuel vapor lines are reproduced in the same shape and look as originals, but using upgraded stainless steel for lifetime use. Don’t forget the correct Corvette Fuel Line Clips!