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Actually, I've just had a thought. If I temporarily block the downpipe from the header tank with a bung, that should create enough of a vacuum for me to fit the hose. Do I need to block the expansion pipe as well?

Yep, they sure are. I was hoping that there was some clever technique but I've got a feeling that there isn't - I'm just going to have to be quick. The problem I can see is that the square bit that you open up with the rad key actually comes out completely. That means that I have to undo it...

Hi All, All my rads are connected via microbore copper pipe to a 22mm manifold. The lockshield valves on the downstairs rads all have a drain facility as you'd expect, but I have two questions: 1. When draining the whole system, am I right in thinking that I should drain via whichever...