High quality, affordable activated carbon filter replacement for: 4204490, 4290510, PRO 48, PRO48, 4290510, F-1000, F-2000. Fits Sub-Zero Refrigerators Manufactured in 2011 or later Reduces chlorine, taste and odor to deliver pure clean and refreshing water. Mist filter line by ClearWater the Higher standard in affordable water filtering. Long lasting up to six months or 200 gallons Tested and certified by Iapmo R & T to NSF/ANSI Standard 42. Will fit and lock in all compatible refrigerators. Guaranteed.