This Refrigerator Water Filter is used in side-by-side and top mount refrigerators with filter access inside the refrigerator. Simply turn the filter 1/4 turn to remove and replace. 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 8171787, 2204326, 2206039, & 2213384.