Thanks Rob. I've stuck a picture below.
It seems like it should be 16mm eurocone but the "nut" sizes - the chrome nut on the white pipe - and the thread it screws onto - is way bigger than a 15mm compression fitting.
If I look at a 16mm eurocone to 15mm pipe convertor it looks like it would...
I've had a mouse nibble a plastic UFH pipe. Process of elimination and I know it's 3 loops. It might be 1, 2 or all 3. I have a pressure pump and want to properly test each loop in turn over space of a few days or longer to be really sure which is losing pressure and also to help locate it.
The...