you're absolutely sure? the smiley face looks like you are joking? i cant afford to get this wrong. do you know the official term for what they are if they are not TRV's?
thanks in advance.
its not that simple, i am doing some coursework, part of that coursework is identifying whether these actual things are TRV's. The TRV's on my radiator look different, but these look like they might serve the same purpose??
please can someone confirm?