[pistonbroke]

What I have found with these fittings is , one, you need good copper tubing. Two if you have undone it multiple times you should push the line in about 1/8" cut off the excess and tighten it back in. When using afresh fitting thread it in with your fingers , push the tubing in as far as it will go and hold it in while tightening the fitting with a wrench . Tim