Jim K wrote:

Anyone know the i.d. of 50mm plastic waste pipe?

I have googled in vain.

TIA

I don't know the answer as far as UK 50mm waste is concerned, I suspect
it is ID. But it gets very confusing if you are using Scandinavian 50mm
waste fittings, which don't fit UK 50mm fitings, and are probably 50mm
OD. I'd take a relevant fitting to a big plumbers' merchant.


--

Roger Hayter