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Copper pipe water line is out of round....can I still use a compression fitting valve and just add some teflon tape at the compression nut to ring seat fit. it is slightly oval. I noticed a slight wetness just behind compression fitting. I think I can reset it with a little Teflon placed over the ring setting where the nut stresses down on it.

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I do not think that teflon tape will help with an out of round tube in a compression fitting. My first thought would be to try to restore the tube to roundness by proper use of Vise-Grips with a rag to prevent scoring of the sealing ring. There is a die clamp device designed for gripping tubing to make a flare in the end. This die might be used to restore the tubing to roundness. You might have to remove the ring seal and put on a new one after truing the end of the tubing.

But be prepared to cut off the out of round end and join a fresh piece of good tubing.

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    I might try to round the pipe like Jim says but if already tightened. I would tighten it further and that should pinch the ferrul on the tubing and seal, using Teflon on a compression fitting is not a good idea. – Ed Beal Jul 29 '18 at 19:27
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    I agree with @Ed beal on this, attempt to further tighten and it might seal up. What have you got to lose, it already leaks and is out-of-round. IMO people often do not tighten compression fittings enough. – Jimmy Fix-it Jul 29 '18 at 20:05
  • @JimmyFix-it - Guilty. Mine always leak the first time. – Mazura Jan 11 at 9:46

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