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You can do this with rads, but this one has the tails coming out of the walls, not up from the floor so if it has brackets it needs to be lifted up and off (I can’t see from pic) - it ain’t going to work.
Probably @aggi will have to isolate at the control valve and the lock shield (looks like it’s the same valve either side) and drain the rad (opening the air valve all the way and only taking off one valve helps keep things under control).
I would definitely try using a mini roller to paint behind it first, are you using a very different colour?
absurdbird-
Ha, didn't realise someone had just asked the same question. Cheers @Soul Need to investigate the valves a bit more as one of them does adjust the water flow but the other appears to be fake and just spins freely.
Yes, think it needs to lift up a bit looking at the brackets.
New colour will be purple so pretty different. A normal mini roller definitely won't fit behind, are there extra slim ones for behind radiators?
aggi
I think someone suggested on there that you can, ahem, loosen the couplings then rotate the rad down and on to the floor, negating the need to take it off completely or drain it.
Obvs needs a bit of clearance and a wall fixing that allows this.