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newshound

On 12/03/2018 19:22, 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?

Not off the shelf. Whether you could make something out of shim, I
wouldn't like to say. But the odds are that the axial positioning will
also be wrong. You *might* get away with it. How much is your time worth?

If the original valve is old, and/or not Drayton or similar quality I
would not spend long on it.