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I drained it - because I wouldn't know an AAV if it jumped out and bit me !

Thanks for the explanation. The only thing is I neglected to say the installation in question is a sealed system, so there is no header tank.

I need to move a radiator a couple of feet along a wall. I have been told that a 'proper' plumber would not drain the system down but would instead either freeze the pipes or "air-lock" them. Could someone explain this "air-lock" technique please ? I am replacing all of the floor boards, so I...