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I was looking to drain down my CH system this weekend to fit TRVs throughout the house as none were ever fitted downstairs and half of the upstairs valves are stuck open or closed but I seemingly have no drain off. I do however have a T piece lockshield on all of the downstairs radiators with...

Hello all, Got a leak from where the push rod comes through one of the valve diaphragms to the microswitch. Do I need a complete diaphragm kit or just replace the gland nut and o-ring? If i need a full kit, which kit do I need? It's the 80E (I believe there were two valves) and it's...