The rads I took off have metal couplings, was hoping to just be able to get the right sizes of those (and then get someone more competent to replace the valves in future).
Im pretty sure i know what your talking about, yeah you can swap them onto the new rad. Question what kind of heating system do you have in? is it a combi
It's worth changing the valve to fit the TRV, so that you're not fannying about with cheap plastic adapters.