John wrote:

I thought it was very bad practice to use PTFE on compression fittings. The
seal is done by the olive gripping the pipe and being located in a very
clean conical fitting. The thread has no role in sealing - so PTFE has no
role.

There is no role in the sealing, but it does help lubricate the thread
and hence makes it easier to tighten smoothly.

--
Cheers,

John.

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