I have just bought some TRV's for fitting into bedroom radiators. These come with a union or tailpiece that needs to fit directly into the radiator i.e. fits between TRV and radiator. This has flats on it so you can get a wrench onto it. However the union already present on the radiators are round, no flats, and the gap between the body of the radiator and the nut it too small/narrow to get any tool I know of in there. How do I remove this union/tailpiece?
Ian
Ian