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The factory line you nicked is DOT approved. If you use a DOT approved connector to repair it, you are all good.

By law you are supposed to use D.O.T. approved fittings and tubing on brake systems, so it's not good practice to do substitutions.

Not a simple answer. It's copper tube, but it's special air brake copper tube which is thick wall and not available commonly as the world has moved on to plastic tubing. Butt splices available these days are also not intended for this type copper tube. The fitting you need is a Tectran...