I have a concealed shower valve and want to fit a shower outlet elbow
about 15cm beneath the valve, leading to the hose etc.

I can't figure how to fit the elbow. It has a female 0.5" BSP parallel
thread and slight chamfer to the entry of that thread, indicating to
me that it would like to see an o-ring.

The problem I have is that it all seems too precise. I will have to
know EXACTLY the level of my tiled surface so that when the o-ring is
properly compressed the elbow, and its chromed flange washer, will be
comfortably firm against the tiled wall.

Am I doing this wrongly? Should I be just bodging it with some setting
plumbers goop and not using an o-ring at all?

I have a concealed shower valve and want to fit a shower outlet elbow
about 15cm beneath the valve, leading to the hose etc.

I can't figure how to fit the elbow. It has a female 0.5" BSP parallel
thread and slight chamfer to the entry of that thread, indicating to
me that it would like to see an o-ring.

The problem I have is that it all seems too precise. I will have to
know EXACTLY the level of my tiled surface so that when the o-ring is
properly compressed the elbow, and its chromed flange washer, will be
comfortably firm against the tiled wall.

Am I doing this wrongly? Should I be just bodging it with some setting
plumbers goop and not using an o-ring at all?

I had a pretty similar problem. Managed to sort it with a combination of
lots of washers stacked on top of each other, hemp, jointing compound and
some silicone. No leaks so far! touch wood

See:
http://groups.google.co.uk/group/uk....d5aca0796c16f/

Andy

I had a pretty similar problem...

Thanks for that link, I am relieved that it isn't just me puzzled over
this fitting. I like good engineering so the thought of goop holding
things together isn't particularly appealing. However the shower elbow
is a parallel thread so I am going to need some kind of fibre washer
or preferably an o-ring against the stop of bulkhead style fitting.
the o-ring should give me more adjustment on the elbow so that its
outlet points downward.

It's the adjustment of the 'bulkhead style fitting' from the elbow
that is causing me concern. I am tempted to construct this fitting
using a running BSP parallel with a backnut to form the flange, but
even with the o-ring fitted this thread won't be a seal unless I fill
it with goop. The backnut would give me the adjustment I need though,
even AFTER the tiles are fitted.