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Unusual radiator lockshield valve

Posted: Thu Dec 01, 2022 6:09 pm
by ChrisButch
I have a new radiator with a lockshield valve of a pattern I've not seen before - it has two concentric hex sockets (at least I think the inner one is hex, but it's quite small and difficult to be sure). I can't work out which of these adjusts the flow - but in any case I can't shift either of them in either direction! Any advice welcome