On 16/06/16 15:50, Roger Mills wrote:
On 15/06/2016 22:50, Jackson wrote:
On Wed, 15 Jun 2016 22:35:30 +0100 (GMT+01:00), jimk wrote:

Wrote in message:


When you screw in an outside tap into the wall plate, how do you
ensure that
the tap is screwed in very tightly to the wall plate so that it will
not move
or leak - and the tap is itself vertical?


Ptfe tape on the threads :-)

Yes - but how does that ensure that when you tighten the tap up it is
at 12
o'clock and not half past six?




It just needs to be tight enough to make sure that it doesn't;
a) leak
b) move of its own accord

It will get even tighter over time - corrosion, etc.

Personally, I prefer Boss White and hemp over PTFE tape for joints where
alignment matters. Greater tightness vs number of turns.

But for the record, I have to interject with "not on potable systems".
It's OK for heating - but the hemp itself has been regulated away as a
breeding ground for bugs.

There are potable versions of Boss White - Boss Green is one (though I
find it not very good) - and there's a PTFE variant of hemp, though not
at all common.