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Corrosion protection?

On a sealed central heating system, how do you put the anti-corrosion fluid into the system.
Keith, June 2006
IT GOS IN THROUGH THE BLEED VALVE ON THE RADS WHEN YOU PURCHASE THE INHIBITOR TELL THEM ITS A SEALED SYSTEM AND THEY WILL GIVE YOU THE TUBE AND FITTINGS

HI-SPEC PLUMBING, June 2006