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Kerching!! The light's just come on. You are quite right, the pipe diameters ( as opposed to the thread diameters) are 15mm and 22mm. I presume that I need to get a tail (I'm getting all technical now!) that steps the radiator inlet from 22m to 15mm. Funnily enough, I have changed all the...

Kevplumb, you'll have to excuse my ignorance (many do). I measured the old valve across the external diameter of the threads, that is where I got the 22/27mm figures from. Is this wrong? When you say 'change the tail' do you mean the part going into the radiator?

My thermostatic radiator vallve has finally given up the ghost, but I am having a real problem getting a replacement. It looks to me as if the pipe connection is 22mm and the radiator connection is 27mm. I have only been able to find valves with 10 or 15mm connectors. Any help greatly...