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Afternoon Guys I'm running new Brake lines up front on my 72 GMC half ton 3/16 Brake line I went to my local NAPA store I got 2 front hoses, line size 3/16 one hose is a 3/8 tube nut the other hose is a 7/16 tube nut counter guy couldn't tell me why I have 2 different size tube nuts any body tell me why Thanks