Rick Hughes wrote:

wrote in message ...
We have a flat which was originally plumbed with BS3505 plastic pipes.

I need to re-plumb a section which starts as the old BS3505 pipe and
Chris Green


Chris .. if you measure OD and ID and post the result, a suitable fitting
can be suggested.

As noted way back at the beginning the OD is 21.5 mm.

It's so close to 22mm push-fit that I think I may get away with using
some 22mm push fit.

Alternatively I have found that solvent weld 21.5mm overflow fittings
are a good fit too.

The object of the exercise is to remove about 10 feet of redundant
(and wobbly) pipework that runs up the side of a cupboard and then
back down again. It used to fill a hot water cylinder at the top of
the cupboard, now it's just the mains feed to a combi boiler that's
elsewehere.

Thus it may be that the easiest way to do the job is to re-use the
existing old plastic to 15mm connection (which is perfectly sound),
cut out all the redundant intermediate bit and rejoin the two old
plastic ends with a 21.5mm solvent weld fitting. I wouldn't use an
overflow *pipe* for mains pressure but the simple solvent weld
straight join will be almost totally supported by the inserted ends of
the existing pipe so I'm sure it'll be strong enough.

--
Chris Green