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Can this be used on a plain cut piece of aluminum tubing or does the end have to have anythign special done to it? Also, how do you keep the nut from sliding down the tube farther when tightening it?
If this is for a fuel return line using the stock feed line, Use a -6 ( or whatever size your using ) to 3/8 tube adapter. So yea, the metal line is 3/8".