The leak seems to be from the thread of the valve nut.( I.e what turns to shut and open valve. Not sure I know what the you mean by the knob ? I can access the hex nut will that solve what I describe ?
Hi, I was going to drain my central heating system in order to fit some new thermostatic valves downstairs.
Before doing so I was checking my valves upstairs to make sure all were free etc. The combi boiler and electrics were off. When I went to close off the towel warmer radiator in the...