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Rispondi a "Leaks water when brewing ground coffee with a My K-Cup filter."We have the same at work and we've been told by the seller that they sometimes come with that rubber ring that is needed sometimes they don't. Our rubber ring goes around the metal needle on the top part of the machine (the needle that usually puncture the regular K-Cup) i've seen other types fitting on top of the grey adapter's cover. once you have this, no more spills! Cheers!