DESIGNED TO FIT: Amana, Jenn-Air, Kenmore, KitchenAid, Maytag and Whirlpool models with a long, narrow filter installed in the fridge ceiling. NSF 42 CERTIFIED: Tested and Certified by WQA to NSF/ANSI 42 for chlorine reduction and NSF/ANSI 372 lead compliance. HIGH EFFICIENCY FILTRATION: Provides 2X the filtration power as compared to 2 micron filters at reducing Chlorine Taste & Odor, Rust and Corrosion, Sand Sediment, Silt, and Turbidity.