I was thinking of adding a sight glass to my keggle but, after thinking about it, I declined. It would be easy to use except I would be worried about the volume of unboiled wort that you are always "seeing" getting drained into the fermenter post boil. Maybe my concept is wrong, I would love to have one but don't want to risk any infections. Has anyone had or expirienced any issues with them? How do you fix them.