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drain the system or the rad?

  1. M

    Radiator valve with drain plug - What does it drain?!

    Quick question before I drain a rad to take it off... I have a combined radiator valve and drain plug but I’m not sure what the drain off drains! If I close the valve to stop water entering the rad and I then open the drain off nut, does the water come out from the rad or does it come from the...
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