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I'm wondering about a little gizmo on the side of the radiator on my 91 Legacy. On the right side of the radiator, a couple inches below the air bleeder screw is a recess, maybe 1/2 0r 5/8" in diameter. In the center of that recess, is a stem, that appears to be a hex shape. I'm at a loss as to what this thing is ??

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