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Belmont type rad valve (old) leaking slightly in my bedroom, round the top, I've never had to change any of my valve before or fix them, I believe i need a new oring (s) for these type of valves.... as they're unlike the packing gland (ptfe) standard rad valves, do i need to drain down to...

I have 2 questions, if anyone could offer me some advice it's be great: 1) I have to re-fill my heating system, and want to add corrosion inhibitor. The system is SEALED though, so I have to inject it via the radiator vent I believe? The problem being, my radiator vents are the in-built...