Outer Limits 4x4 Board

Quick question... I was doing a coolant change today on my runner, went to open the tap at the bottom of the radiator and it was firmly stuck... gave it a bit of force and the entire thing came off (metal base and all)... Tried to fit it again and can't form a seal - Is the base supposed to come away from the radiator?

get it re soledered or brazed,wont cost much

Thanks mate.

yeah sometimes after being heated up and cooling down all the time theyll stick and when u try to undo it itll just break