I'm about to rejig the waste pipes in the bathroom, and I had assumed that
40mm and 32mm were direct replacements for 1 1/2" and 1 1/4". But one
fitting I've got says on it 11/2" (38mm) The existing wastes for the bath
and basin are grey. Am I going to have compatibility problems? If so, I'd
like to know before I take anything apart.
It seems to me that even if you use the same nominal size, you'll have
potential problems if you don't use the same make. They don't fit one
another. Colour is not the issue, but the make is. Look for the maker's name
on the fittings that are already installed and get the same.
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