On 22/02/2017 13:19, DerbyBorn wrote:

That is a mess. Those places where I see PTFE poking out, look to me as
if they were intended to have a fibre washer fitted between flat faces.
You might get PTFE to seal, but only if you can get a regular layer of
PTFE around the threads and of just the right thickness, which is
unlikely - so it will leak.


What I was thinking (Looks like a tap elbow)- I would be inclined to take
the photo to a decent Plumbers Merchant and get the correct fittings for
the job.

Althought PTFE on the tread is not the solution, it should be wound on so
that screwing the fitting will tend to tighten the tape - and not push it
out.

If one were going to try and get a seal on that with PTFE you would need
to be quite careful with the winding of it - basically creating a taper
shape[1] on the thread with the tape, so that the "screw in" resistance
increases sharply as the stub penetrates further into the female thread.

e.g. you start with say 4 or 5 turns toward the tip of the thread and
work up to many more (10 to 20) laid up toward the back of the thread) -
winding the tape on "edgeways" so that it folds up helps build thickness
faster.

--
Cheers,

John.

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