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You don't need any more caps if you have turned the valves off at both end.
Of course, for the TRVs, they just operate the valve underneath so you can just pull them off and turn the valve manually and leave off until you've painted.
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They aren't TRV's so won't open once closed until you open them again. Yeah you can use it, you'll need to top up the pressure again when you rehang it. Also tape the olives on the valves when you rehang as it'll save it potentially leaking.
Soul
konastab01
@aggi
Cheers. I think taking it off is probably the wisest, I'll see what is under the fake valve. No carpet in that room so not the end of the world if it drips a bit as I take it off. After closing the valves do you need additional caps over the exposed pipes or is that only for TRVs? I assume I can still use the central heating whilst it is off?