⚠️ Compatibility Warning (Please Read Before Buying): Keurig water tanks are highly model-specific. This tank WILL NOT fit the K200, K250, K300, or K350 series. It also will not fit newer models like the K-Elite, K-Cafe, K-Classic, or K-Supreme lines. Please check the bottom or back of your brewer to verify your model number starts with K4 or K5 before purchasing.