universal slim design installs quickly and easily to replace cartridge of Culligan undersink filter no US-550 and US-600. Also fits Culligan no US-560, US-560K, CTR-210, RO-3167, SY-2000 and SY-5167, Omni, Sears, Fulflo, Teledyne Water Pik, Ace, Flotec, Honeywell, General Electric, American Plumber and most other standard size water filters. Activated carbon impregnated cellulose provides clean, fresh drinking and cooking water by reducing sediment, chlorine taste/odor, unpleasant tastes and odors (5 nominal micron rating). Up to 3-month/250 gal life. NSF International tested and certified.