In article . com,
JohnW writes
After the dreaded ceiling damp patch, I have succeeded in raising a
portion of chipboard flooring and identified the problem as a leak
where the bathroom basin waste enters a short horizontal section of
110mm soil pipe at a boss connector. The toilet also connects at this
same boss, toilet in the top and basin waste at the side
t
Ob


The house is about 15 years old. The basin waste connector to the boss
had half fallen out. The connector is 40mm push fit and looks more like
a mini toilet pan connector with 3-4 rings of rubber which form the
seal.
Is the best course of action to try and source a new seal (any ideas?)
or clean the old one up and add some other form of sealant as well
before re-assembling. You may have some other ideas as well. The soil
pipe is under the floor and I am loathe to have to replumb the waste
from the basin as access to this is very poor.

If it's the kind I think it is then they have a reputation for popping out. You
may find that the boss itself is solvent compatible allowing you to use a
solvent adaptor to mate securely with a solvent pipe. That said, I would
consider some way of dismounting the (small) pipe in case of blockage,
you could do that by using a straight compression coupler just a bit back
from the boss. See the BES site for examples: http://www.bes.ltd.uk item
12993, http://www.bes.ltd.uk/products/130a.asp near the bottom (valid for
this catalogue only). Actually, item 12987 (same page) may do both jobs
in one.
--
fred
Plusnet - I hope you like vanilla