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As has been said, the silver knurled ring will twist off but might be a bit tight/cruddy. I've fitted 7 of them now and all barring one used the most annoying of adaptors. The Tado instructions are pretty good at showing you which adaptor you'll need. Let me know if you have trouble and I don't mind having a crack.
Good idea to clean the threads of where the new TRV is threading on to as they could be a bit cruddy. One of mine ended up coming lose because of this so wasn't turning the rad off. Easily fixed. Also, the little nubbin that the TRV actually pushes down on to close the valve can be a bit sticky if old so you can just push that in and out a few times to loosen it. But the Tado app will tell you if something is fucky when it calibrates.
stevo_com-
the little nubbin that the TRV actually pushes down on to close the valve can be a bit sticky if old so you can just push that in and out a few times to loosen it.
Every year most of mine need soaking in WD40 and encouraging in and out with some pliers before they move. They all seem a bit corroded from tiny amount of water getting out. Is that normal? They aren't that old, maybe 7 years.
hoefla
I'm just trying to swap over the thermostatic valve on my radiator with a Tado smart one.
Tado suggest you can usually unscrew or just pop off the top cap of the existing valve but it's not working too well on this one and I don't want to break it right now.
Any clues?