Introducing the Frigidaire PureSource Ultra Refrigerator Water Filter, part number ULTRAWF. This essential component is designed specifically for select Frigidaire French door and side-by-side refrigerators manufactured after 2008. It guarantees clean and pure water for your household by reducing harmful substances and improving your water's taste and odor. - NSF Certifications 42, 53, 372 and 401 reaffirm its quality.- Reduces parasites, lead, chlorine taste, VOCs, and some pesticides and pharmaceuticals.- Designed specifically for select Frigidaire and Crosley refrigerators post 2008.- Replace every 6 months or sooner for best results. Please follow the package instructions for a hassle-free installation. The ULTRAWF replaces former filter part numbers 241791601, 242294401 and ULTRWF, adding to its versatility.