Tim,
Teflon tape would not keep a flaired fitting from leaking if
that is what you are looking to do. Actually, a compression fitting is a
more reliable fitting than a compression type nowadays. The flair could
develop a crack and it would then leak. I've never seen a compression
fitting crack yet.
Just remember that IF a compression fitting is leaking,
*remove the pressure before tightening* to stop the leak. There is not
much chance of ever stopping a leak on a pressurized water line that I know
of.
Tom
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