Hi,

The waste water pipe from the bathroom sink passes through the wall
into a 90 degree bend on the external wall. Now as far as I can tell
the bend is a push fit rather than a screw threaded type used on other
waste water pipes at my house. Now this makes the fitting very "slim-
line". However, the bend is partially "embedded" within a mortar
rendering and the external "down" pipe has worked loose. I have pushed
the external pipe back into the bend (tricky because it is jammed
behind a vertical soil pipe). However, I don't think the pipe has
fully "engaged" in the bend and I'm pretty sure it will work loose
again. What's the best way to repair this permanently? I'm thinking of
chipping away the morter and replacing the bend with some other
fitting - but I'm not sure what to use or whether there is a much
simpler way to make a good repair.

Any ideas would be most welcome.

Thanks

Clive