>> Next question: One of the radiators is a double panel, convector (it's got square corrugations
>> between the panels). I can't find a bleed screw on it.
>> There's a couple of (heavily over-painted) domed heads.
>> Do these reveal a bleed screw, or are they plugs into the water jacket?
>>
I have a similar radiator and have just checked it out
There is a small plastic domed cover on the corrugations side of each panel.
One is at the end of each panel i.e one on the left end and the other on the right.
Mine are not overpainted and a finger nail lifts the cover to expose the common square bleed screw.
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TRVs new
TRVs new