On Mon, 14 Feb 2005 19:56:04 +0000, Steven Briggs wrote:

In message .uk, Ed
Sirett writes
Question is, do I need special fittings for this or will just fit a
normal 22mm compression stop-tap?
Can 1/4 turn ball valves be used in this position (more reliable?)

The pipe is more likely 20mm OD. UNless you measured it accurately in
which case I apologize.

Whatever you do any form of compression fitting on plastic pipe needs a
support insert in the end.



Dead on 22mm, measured with verniers. As the pipe was painted above
floor level, I had assumed it was copper until I pulled up the floor
boards and saw it was actually black plastic. A google revealed a couple
of threads suggesting this stuff is very thick walled, so I not sure it
does need an insert, or if a standard 22m olive will do the job.

The blue stuff is certainly 20/25/32mm.

A push fit type joint will likely be better than a compression one if you
have no support inserts.



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html