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.