I have an old Drayton TRV 3 which has now broken. The new (replacement?) TRV 4 has a larger thread, which means I cannot simply replace the failed body.
Am I right in thinking that all new TRVs of any make now available will be the new size?
Can one still obtain new bodies in the old size thread?
If not, I guess I have to drain down the system and fit a complete new unit?
Am I right in thinking that all new TRVs of any make now available will be the new size?
Can one still obtain new bodies in the old size thread?
If not, I guess I have to drain down the system and fit a complete new unit?