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Andy Burns[_13_]

wrote:

This is slightly difficult to explain. I've just bought a Honeywell TRV
head (TRH4M30WBG) to fit to a valve that previously had another make of
head on it. The thread (30mm) is correct but the central nut on the
valve is smaller than the internal TRV body is designed for, so the body
tends to turn when the head is adjusted. Is there an adapter available?

I think thee are 28-30mm adapters from Myson, and IIRC some old
honeywells may even have been rebadged mysons ...

e.g.

https://www.amazon.co.uk/Myson-adapter/dp/B01CEVYC8S

at that price I'd be looking elsewhere, but you get the picture.