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OK, how do I add a picture?

Sort of. I've taken a picture of the one on our boiler. Apologies for the quality - I couldn't get the camera to focus properly. The bit that's circled is where the water's coming from. Loks like the whole of the brass barrel can just screw off and a new one screw on in its place. Is it really...

Uh, thanks, but AAV? I'm guessing the V is for Valve? Rich

Hope someone can help... I've got a Ferroli Optima combi, I've drained the central heating and replaced all of the radiator valves with TRVs. Come to repressurise the central heating (something I've already done 2-3 times over the past 2 yrs with no problems) and it pressurises, the TRVs are...