In an earlier contribution to this discussion,
Brian Sharrock wrote:

"Set Square" wrote in message
...
In an earlier contribution to this discussion,
rbel wrote:

All the cold water piping from the tank to outlets in our 1970s
property is 17mm OD grey plastic piping. Grateful for any
suggestions on how to adapt this to copper. I would strip
everything out and start again but the existing is neatly buried in
walls or the concrete floor.

That's an unusual size! What sort of fittings are currently used?
Can you upload a photo of a bit of pipe with a fitting somewhere
on-line, and post a
link to it here?

It wasn't an unusual size at the time (seventies) ...
indeed my BCO more or less insisted that such pipes
were used for cold services. {when the existing lead pipery
was being removed and replaced. IIRC, the pipes were
made by 'IMI ~ Yorkshire" under the trade name 'Poly-York"
-[I may have this wrong]. The pipe was meant to be solvent-welded
with in-line joints made with a female-female union.
I had grey pipes (large) and black (small) diameters equivalent
to 22mm and 15mm copper. {Once again this may have been a vagary
of supply]. Unions, elbows, tap and tank connectors were all
available. Connection onto the cold-water main was via a
tap-connector. When I needed to modify the design , I could
no longer source the bits. I discovered that a push-fit connector
actually went over the 17mm OD ... after which it's an exercise
in connecting to the resultant copper pipe.

Apparently, as the hot water (adjacent) pipes had to be copper
the plumbing trade didn't find using a parallel plastic circuit
either cost nor time saving and the product went off the market.

I hope to banish the final circuits of it from my house over
the next twelvemonth ... when I get a round tuit.

I must have missed out on that - because both my previous and current (where
I've lived since 1977) houses were built in the 1960's - presumably before
this plastic stuff came into use.

My previous house did have some stainless steel pipe because it was built at
a time when copper was scarce - but that was the same size as imperial
copper 1/2" and 3/4" pipe.

More recently, I have used Acorn/Hep2O/Speedfit plastic pipe - but that has
the same ODs as metric copper pipe - so 17mm still seems a bit of an oddity.
--
Cheers,
Set Square
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