EveryDrop by Whirlpool Refrigerator Water Filter 4 EDR4RXD1Z (Pack of 1) NSF Certified to reduce 23 contaminants, including pharmaceuticals, waterborne parasites, lead, mercury, and pesticides Certified to fit these leading refrigerator brands: Whirlpool, MAYTAG, Kitchen Aid, JENN-AIR and Amana Used in bottom freezer and side-by-side refrigerators which accept Filter 4 Replace filter every 6 months or 300 gallons to maximize contaminant reduction Certified Genuine Part by Whirlpool Corporation