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Hi, thanks for your reply. I drained my system to replace a radiator valve. When I re-filled the system, the valve began to leak. I can see two nuts on the valve and wondered if I could just remove and replace myself? Regards, Dave

Hi, my boiler is leaking from what looks like a large isolation valve, though I'm not sure if thats what it is! Its losing about 50-100ml a day, this increases if the boiler is left switched off for a few hours. The valve is attached to the central heating flow pipe on the boiler...