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I recently replaced the drain tube in my splashwell with brass. I got the flaring tool from Sue at Twin Cities. I got the tube and O-rings from McMaster-Carr. I already had an air hammer. The only problem I found was that the flaring tool only made a 90 degree flare and did not put that return curl on the flare that helps hold the O-ring from spreading. After making the initial flare with the flaring tool I gently tapped the outside edge of the flare with a small hammer evenly all around just enough to put that little bit of curl on it. I put the tube in the hole, put the O-ring on the outside and marked the tube on the outside of the O-ring while putting pressure on the inner flare. I then added 1/8 of an inch to that line and cut the tube and annealed the brass. I used the threaded rod to compress the flaring tool for the second flare after packing everything with 5200 and cleaning the excess. The tool once again made a 90 degree flare. I then gently tapped the outer edge of the second flare with the small hammer to put the curl on it. I have found that cutting the tube the proper length and annealing the brass is critical to the installation. The installation looks "Factory" and I only had one practice run that I wasn't satisfied with because I cut the tube a little too long.