TRV valve won't fit...Have to replace a TRV valve..thought I'd just relace the head and save on the messing about.. Bought a standard 15mm replacement..went to screw the head replacement on..thread is not standard..inside diameter is approx 1 mm smaller!! See photo attached. Went back to b and q and all the trv heads have same, larger diameter screw on section ...is this normal?
Just want an easy life and not take the radiator off etc...
Just want an easy life and not take the radiator off etc...
