[CWizard]

In trying to locate a small leak in my TKO 600, I discovered a small thimble-like do-dad, top front, that has a small puddle of fluid at it's base. This thing can be wiggled around, and I'm guessing it's some kind of relief valve. Two questions, please: What is this thing, and if it could be the source of the leak, how do I fix it?
Many thanks,
Jerry