I would like to increase the size of my initial radiator pipe to 22mm; to do this I have to replace the ancient fitting on my H/W cylinder, and I'm a bit nervous.
There is what looks like a 28mm, more likely 1 1/8" stub comimg out of a compression fitting that appears to be screwed in to the cylinder.
Could anyone tell me how to make this into a 22mm stub that I can plumb away from; I guess I'll need to replace whatever fitting screws into the tank, but I don't want to undo things I can't do up again !
Or will I need a new cylinder..... next year?
I'd be grateful for any help
mike r