2 Pack Best Choice BCF49 Fits InSinkErator F-1000 Sub-Zero 4204490 4290510 Water Filter AFFORDABLE OPTIONS: Costs less than OEM filters without compromising any quality or flow rate CERTIFIED QUALITY: All Best Choice Filters are tested and certified by IAPMO to NSF Standard 42 for Structural Integrity, Materials Safety, Chlorine taste, odor reduction and System performance. Quality you can taste! HIGH EFFICIENCY FILTRATION: Activated carbon blocks certified to ensure contaminant reduction for 300 Gallons Or 6 Months, depending On Water Usage And Quality Fits Sub-Zero Refrigerator Water Filters : 4204490, PRO 48, 4290510, 7012975