Moved into a new house. I have a sealed system that requires topping up. I have found the top valve. It is on a 3-way T-bar (not sure if that is the right term) shown below connecting 3 pipes together:
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The outlet pipe running from my red expansion tank in my sealed system to the outside suddenly started to drip. The pressure guage on the expansion tank was at 5 bars (not sure if this is correct or not). I tested the release valve on the outlet pipe and the pressure reduced (didn't want to...