"Arfa Daily" wrote in message
...


Thanks for that John. So, 1/2" and 3/4". Where on earth is that measured
to equate to the sizes I measured at the threads ? The logic and history
of plumbing fitting sizes are beyond me ... :-)

Arfa

BSP thread sizes relate to the internal diameter of some notional steel pipe
they were designed for. Beyond that I'd have to google.
With all these new building regs:- FENSA, Part P etc. You would have thought
that HMG would have standardised (with a "z" if its a British Standard!!!)
plumbing fittings. I'm in the middle of a major house replumbing exercise
and I've just had a look at some of the spanner sizes I've been using (or
thought might fit) Whitworth 1 1/4,1,...5/8, AF 2",1 3/8, 1 1/8, metric
30,28,24,22,19,18. (and end up using one of the 4 sizes of Bahco
adjustables or one of 2 sizes of slip joint pliers I have). I found no
evidence of consistency on the size of a 15mm compression nut across
manufacturers. I can't understand how plumbers manage - or is it only in
DIY where there's sure to be a joint that requires a spanner and an
adjustables' jaws are too wide to fit into the gap or they are too thick and
foul another part of the fitting?

Whilst I'm in grumpy old man mode I've been told that English Nature /
Natural England have just produced a glossy brochure with picture of farmer
on his ATV and 2 slight problems have been identified with this picture.
Firstly no crash helmet being worn and secondly he has a passenger - a
child. You just can't beat "joined up government"

PeterK