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Thanks So do I need to replace the pump? Or is there a way to fix it? Why does water start coming out when I unscrew the valve bit?

Hi there, I have a bit of an issue with my heating system and I'd be grateful if someone could help out... Basically I have a Grundfos MK11 pump which leads into a Tower 2 port zone value. The issue that I have is that there seems to be a bit of a leak coming out of a small gold screw type...