Thanks, I will probably will have to do this but I did not want to drain the system down if possible to fit but it looks like I will now have to do this.
I have a micro bore system and want to replace a single radiator with a double radiator to produce greater heat output in the room. How can this be achieved when the existing input/output valve has a copper pipe running into the inside of the exiting radiator for the flow return? With a standard...