Unusual radiator lockshield valve Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[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