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    Changing an 8mm rad valve to a trv

    I have 8 x rads with 8mm valves fitted. I want to c/out to TRVs but can't seem to locate plain 8mm trv's. I can find plenty of trv's labelled as 8mm but they are basically 10mm or 15mm with reducers & I don't have sufficient tail length to fit an 8mm to 10/15mm conversion. I basically wanted...