It is convenient to connect a boiler 3/4" plastic condensate drain pipe
to a 110mm grey soil stack pipe. There are straps that wrap around the
stack making a tee piece with a hole cut in and 32mm pipe and the likes
connected. This is commonly available. I haven't see any on these that
connect onto a 3/4", or is it 21mm, plastic condensate pipe. Anyone
know if and where they are avialable?

TIA and happy new year to you all