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Agree with Terry. Although to be fair the range of joints in plumbing is bloody confusing, not only are there solder ring, end feed and compression, but there are two types of threads that are the same size but some the male is conical and the female is long enough to seal on the threads with PTFE. Then there is unions which are flat faced and use a fibre washer. Unless the maker decide an o ring would be better on some proprietary fitting.
And that's not even getting in to push fit, crimped, and I'm sure there's more!
2 tubes, how many ways to connect them end on?
Anyway back to the OP,I know how you feel, but follow Terry's post above, PTFE only on the cylindrical thread, plenty of turns so it seals on the PTFE doesn't screw all the way down, and you should be ok.
And that's not even getting in to push fit, crimped, and I'm sure there's more!
2 tubes, how many ways to connect them end on?
Anyway back to the OP,I know how you feel, but follow Terry's post above, PTFE only on the cylindrical thread, plenty of turns so it seals on the PTFE doesn't screw all the way down, and you should be ok.