Imperial sizes of microbore tubing?

I am trying to add thermostatic radiator valves to a system that was installed 20-30 years ago. The existing pipework to the radiators is microbore, but seems to be a size intermediate between 8mm and 10mm. My guess is that it's an imperial size of microbore (3/8" perhaps?)

Any thoughts about what it may be and how to adapt to 8 or 10mm fittings?

Cheers,

Mike

Reply to
Mike Walmsley
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fittings?

Air conditioning piping still tends to be Imperial, and BES sell it online with fittings - may sort you out

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Reply to
Andrew Mawson

My 1978/79 catalogues only list 8 or 10mm - so maybe yours is older?

Geo

Reply to
Geo

Can you use a solder joint to a piece of 10mm pipe?

Reply to
Michael Chare

Sure... and 8mm

Reply to
Andy Hall

The message from "Michael Chare" contains these words:

There was indeed 3/8" pipe but that was 3/8" bore so the o/d is likely to be over 10mm. Could be 1/4" bore if the wall thickness is as great as larger bore pipes but I have no figures to confirm.

Reply to
Roger

Thanks for all the suggestions. Actually solved the problem by borrowing a nifty little pipe expander that stretched the end of the tubing up to 10mm OD for compatibility with metric fittings.

Mike

Reply to
Mike Walmsley

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