Replacement head for Myson TRV2 thermostatic radiator valve (head only - no valve included).
This head is also suitable as a replacement for the older TRV 2 Way head (shown below)
The lock ring has a M30 / 30mm x 1.5mm metric thread. Myson has used this thread for a long time, though very old (pre 1997) Myson valves used a smaller 28mm x 1.5mm thread.
The picture below shows what the very old (pre 1997) thermostatic heads with M28 threads looked like. If you need to replace one of these you'll have to buy a new head and an adaptor (available in our store).