Culligan D-20 / D-20A Standard 10 Inch Undersink Carbon Water Level 1 Filter New Condition: NEW Filter Life (Gallons): 1,000 - 2,500 Filter Life (Months): 12 months Fits Brands: Culligan US-550, US-600 and SY-5167 Compatibles: 34375, 38509, 49640, 432636, 3436517, 4234375, 826-746, Ace49640, AmericanPlumberWCC, AmetekCTR-210, AmetekKleen-PlusC-10, AmetekUS-560, D-20, D-20A, FlotecT02, GEFXUTC, GEGN1S15, GEGN1S15CBL, GEGN1S20C, GEGX1S01C, GEGX1S04C, GEGX1S15, GEGX1S15C, OmniFilterCBF1, OmniFilterCBF20, OmniFilterCBF3, OmniFilterDeluxe, OmniFilterGAC1, OmniFilterGAC1-SS, OmniFilterOB3, OmniFilterOT2, OmniFilterOT32, OmniFilterSFM2, OmniFilterSFM3, OmniFilterSuper, OmniFilterTotal2, OmniFilterTotalPlus, OmniFilterU400, OmniFilterU450, OmniFilterU500, OmniFilterU600, OmniFilterU700, OmniFilterUC2, RO-3000, RO-3500, Sears34375, SY-2000, SY-5167, TO2, TrueValue826-746, US-550, US-560, US-600, 1020696 Product Description Undersink replacement water filter for water filtration systems that use 9 3/4 inch x 2 1/2 inch cartridges. Fits Culligan US-550, US-600 and more. Lasts four times longer than the Culligan D-10 Recommended for city and well water supplies Granular activated carbon filter media