"BillR" wrote in message
...

You've got it. I'd recommend hiring a diamond corer for the hole esp in an
older property.
This will have a very clean breakout.
The tricky bit, after doing the above, is connecting the shorter sloping
pipe to the new outlet; but there will be some adaptor(s) that should do
it


Silly question time...

Is it possible/feasible/practicle/stupid to use the chunk of masonry that is
cut out from the new hole to fill in the old hole?

As I said, the wall is fairly new, and the brickwork is in good condition.
I've never used a corer before, so no idea what you get left with.

--
/Slugsie
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