That's the ring that sits atop the drip well? It does two things. One is makes the drip well a little bigger. The other (and this is the important one) is the lip on it's inside top edge catches the top end of the plastic cuff (insulator) around your positive post and stops your positive pole in your 510 connection from being pushed up any higher than it already gets pushed up into the 510. As your "Phoenix" breaks in/down this will become more important. here's a diagram . . . .http://eshotsph.com/products/e-cigarette-kits/Parts.jpg
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