Replacing existing radiator TRV Head which has a "push fit"? connection with an o-ring rather than thread / nut

[wingers]

Hi

Need to replace existing radiator TRV Head which has a "push fit"? type connection with an o-ring rather than a thread / nut. Would prefer to just replace head if I can rather than having to drain system and replace valve etc.

Any thoughts please?

Thank you

Photo below

 

[oldbuffer]

1. Unless you can find the exact same Myson TRV head, I doubt you will get away with just changing the head. Even a head with the same fittings may have a different distance from pin to thermostat, and would not work properly.
2. Try 'phoning Myson and see if they can help, otherwise it is drain down and new valve time.