On Thu, 20 Nov 2008 11:25:38 -0800 (PST), benpost
wrote:

have been doing the bathroom and a neighbour (a plumber) recommended
using grey plastic pipes with screw on connections, which include 4
different 'rings' that must be put on the correct order. a black
rubber washer, a metal grab ring, a white plastic thing with thread on
it (like ptfe tape) and a plastic grey ring.

then tighten it all up. however on two of these elbow bends, i've had
the unfortunate experience of the pipe 'popping' off the connector. as
all the plumbing is boxed in behind tiles i'm worried about it now.
so i wonder if anyone here knows about these connections and if they
are really better than plastic white push fit which i understand and
havent had any problems with??

Sound like Hep2o by Hepworth or Wavin ..whoever they are .
http://www.4bathrooms.co.uk/store/pr...1&cat=0&page=1
Check the site ..There are videos about the product as well.
..They are not really screw on . You push the pipe in to the fitting
..You might need to tighten up the cap after you have fitted it and you
need to push the pipe fully in .
You haven't mentioned fitting the metal pipe support in to the pipe
first .That is absolutely essential .