On Wed, 22 Aug 2018 12:01:49 +0100, Nightjar wrote:

On 22/08/2018 11:16, David wrote:
Looking at diamond drill sizes they are 38mm and 52mm, so logically you
use a 52mm core drill for 40mm waste.

Just double checking as it seems like a lot of over size...

Don't forget that 40mm is the inside diameter of the pipe. Depending
upon type, it may be up to 44mm outside diameter.

Ah. Checked the outside diameter at just over 40mm.

Ikea adapter has an outside diameter of just over 40mm and an inside
diameter of about 36.5mm according to my digital callipers.

The old push fit is marked as 1 1/2". which is roughly 37.5mm. The outside
piping will be renewed.

Looks as though the tight *******s used an old run of pipe outside as
well, which was slightly too short and gaffer taped.

New flexible pipe and old fitting seem to roughly match at around 37mm
external/internal. We can but hope.

Anyway, onwards and upwards.


Cheers



Dave R


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