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I've an old cottage with a waste pipe coming out of kitchen wall to drain, that I need to add to (too difficult to replace at the moment), but I can't yet take it apart to find its internal diameter. It seems to be 34/35mm OD, and I think its been there coming out of kitchen wall since the 70's...

We've a Grant External Oil Boiler (Eco Vortex) that has been losing pressure. We've been unable to trace the leak until today when I noticed rusty damp area under the combustion chamber (not in it as I didn't manage to get a look before the heating came on). This might have been me spilling some...