Hi
I have a Ferroli 77FF combi boiler. The auto air vent is leaking and needs replacing. The problem is it is i cant unscrew it with my pipe grips or stilsons, its stuck solid and i am concerned i may damage the copper expansion tank that the brass vent screws in to. What is the best and easiest way to remove it without damaging the boiler?
Many thanks in advance.

Andrew Devlin, November 2011

spray WD40 try after 5 mints see works if not undo big vent cover clean ball vale make sure drain system ,take air from rads and pump

ltd, November 2011