Without putting a very tiny camera in the lines, there is no way to tell if they are badly corroded inside. I am casting another vote for copper nickel lines. I used them and they seal easier too. The problem I had with th cheap flaring set was that the clamp was not strong enough to securely hold the line in place. The more expensive tool does the job.
Last edited by truckernix; 11/05/2018 6:39 PM.