Will not work on new K-Classic K50 coffee makers with serial numbers beginning with 55. You will need a clean "Side Tank Water Filter" after speaking to Keurig Customer Service. A lot of reviews say this black and gray will work with the new K50, but they're wrong. This is confusing because the recommended clear beer page says Keurig 2.0 for Brewer and my new K-Classic K50 doesn't list 2.0 anywhere. However, this is the correct filter. I recommend calling (866) 901-2739 and asking customer service what accessory they recommend for your brewery based on the serial number. Run, bears.
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