Therefore am I correct in thinking that I need a plumber to fit a completely new valve?
I had a quote a few weeks ago to replace 5 valves which was £450 seemed a bit expensive to me that is why I am trying to just change the faulty heads.
The adapter fits onto the top of the old valve and allows a more modern TRV head to be fitted. Danfoss and Drayton, amongst others, do adapters for their heads
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