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Thanks for advice. Valve just looks like the standard 22mm that you would get from Screwfix. Think the easiest think would be to replace the valves as they are not expensive but does the fact that I have thermostatic rad valves make any difference to draining down the system and how would...

I'm a real novice at plumbing and central heating systems but having had some success at diagnosing that the squealing from my central heating pump was caused by a jammed ball valve in the feed system in the loft I've decided to try and tackle (or at least to understand if I think it's beyond...