newshound wrote:


wrote in message ...
Chris Green

Never come across this before and don't know about converters, but from
BS
3505:1986, the pipe is UPVC and for half inch nominal, the OD is 21.2 to
21.5 mm and the wall thickness 2.1 mm. It's rated to 15 bar.

Yes, I found that much too.


If you've access to machine tools, you could buy a short length of solid
UPVC round bar from ebay, bore one end to take the old pipe and tap the
other end to take a suitable modern brass fitting. Then glue the old pipe
into your new converter making sure you use cement intended for PVC (not
ABS).

That's one approach I suppose!

Well this is DIY!

I don't know if you might just get away with a modern 22 mm push fit
connector. But I suspect that if a 22 mm insert was a reasonably snug
fit,
you might get away with using a 22 mm compression fitting (with a metal
olive) on it. Don't try it without an insert, though.

A 22mm insert will be nothing like the right size will it? The walls
of the BS3505 pipe are *much* thicker than 22mm push fit plastic pipe
aren't they?

Bore of your obsolete pipe will be about 17.0 mm. From samples of 1 from my
spares, Acorn insert is 17.5, Speedfit is 17.7. But if your OD is no more
than 21.5 then an Acorn insert will take the OD up to 22.0 and I'm sure you
can persuade a compression fitting on to that. If your OD is at the bottom
end of tolerance, then even the larger and more readily available Speedfit
is probably OK, especially if you remove the smaller O ring. May be worth
warming up your plastic parts gently. THIS IS UK-DIY!

Actually, on trying it (I've found an old bit of the BS3505 pipe too!)
Speedfit inserts fit the pipe perfectly and it feels like Speedfit
will actually work 'as is'.

--
Chris Green