This PuR® Fast-Fill Refrigerator Water Filter is used in Fast-Fill side-by-side refrigerators with filter access in the base grille. Simply press the release button to remove and replace the filter. This NSF® Certified filter reduces chlorine taste and odor, particulates (class I), lead, and mercury. Replace every 6 months ensures clean, safe drinking water. Replaces 4396842 & 8212650.