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What is this plug on the bottom of my Keurig K-Mini? Saw it when I first bought months ago but forgot to check what it was. Manual and Internet has nothing on
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Amazon.com: Reusable K Cups for Keurig K-Mini, K Mini Plus, K-Express and K Iced with Adapter by PureHQ - Keurig Mini Plus Refillable Kcups for Mini Keurig (3 Refillable Coffee Pods +
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