I have Myson contract TRVs fitted and i have replace one or two heads recently, is it possible to fit another make ie Peglar Terrier TRV head without changing the body angle valves, not to keen on draining system or does each make fit its own?
I have myson contract trv fitted and have replaced one or two recently with the same, is it possible to replace with a different make ie Pegler Terrier trv without replacing the angled valve (just changing the head) not to keen on having to drain the system ?