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I replaced an old Elvox 8870 handset (AC Call, 5 wire) in my mother's flat, partly because it was old and scruffy and partly in the hope that a new one might have a louder speaker. The replacement looks good and works as it should but although I can hear it perfectly well, my mother, who is...

I'm replacing my TRV's with programmable units which have a standard M30 x 1.5 connection to the valve body. Some of my old Drayton TRVs have a different thread, looks like about 27 x 1mm although it is presumably an imperial size. My programmable TRVs come with with a couple of adapters but...