I have had problems with these valves which stay fully open all the time,
is it possible to get replacement trv2 head or can I use a trv4 head on the existing valve?
TRV2 is very old now Drayton did make a conversion to fit a TRV3 head onto a TRV2, but I think the TRV4 head is not compatible, a plumber with a freezer kit would only need 1/2 hr to fit a complete new valve, at not much more cost!
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