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Where can I find the filler? Is that the blue tap I mentioned? As you can tell, technical jargon isn't my thing! :oops:

Hey there folks - quick question if anyone can help. Our boiler pressure was sitting at 0.4 last night after bleeding the radiators. After releasing the blue tap underneath to help increase the pressure, I tightened it as the pressure reached 1.2 However, it has since risen to 2.9 and...