On 12/03/2021 10:37, George Miles wrote:

38mm or 40mm or 43mm,
do I measure the inside or the outside of the pipe?

Its typically the outside diameter that needs to match.

And 40mm solvent pipe is different size than 40mm pushfit pipe !

Yup, by design, so you don't try a solvent weld pushfit pipe (wrong type
of plastic)

aaaarrrggghhhh

Indeed... I keep a stock of both, and a few "universal" compression
fittings so you can transition from one to the other.


--
Cheers,

John.

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