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These are the 3/8-inch steel supply and 5/16-inch steel return lines prior to our application of gravel-guard. It doesn't look like it, but they are actually tucked nearly out of harm's way over the top edge of the frame rail. The gravel-guard will give them even more protection from that rogue flying stone while hazing the rear tires. The alternative is to pull the body off the chassis and run two lines where one line originally ran on top of the frame, and inside the frame rail at the last couple of feet.