Will not fit newer K-Classic K50 coffee makers with serial numbers starting with 55. You will need a clear "Side Reservoir". "Water"Filter" for a conversation I had with Keurig support. Many reviews say this black and gray will work with the new K50, but they are wrong. It's confusing because on the recommended clear beer site Keurig 2.0 stands 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 accessories your brewery needs based on the Serial number is recommended.Run, Bears.
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