An incorrect flare is one of the most common sources of leaks. To help prevent leaks and call backs, cut tubing with sharp wheel in a quality cutter for a clean right-angle cut. To avoid tube constriction, use a light hand on the feed screw.

Since unremoved burrs can break off into the tubing or scratch the flared surface, remove burrs with a deburring tool. A flare tool with burnishing cone puts a high polish on the flare and rolls out a perfect 45° flare for a good seal. Over or under flaring prevents a good seal. Use drop of oil on the flaring cone and feed screw for precise action.