The 4396508 removes contaminants found in your water supply. It is known as great filtration option. The 4396508 creates better tasting water and ice. You will no longer be drinking the particles that are lurking tap water. Our site sells three options of the 4396508. There are aftermarket or factory original models available. The generic 4396508 versions are the Supco WF285 or the Swift Green SGF-W80. We recommend the Supco WF285 because of its great mix of low cost and high quality. The OEM, 4396508 is the Whirlpool. The Whirlpool replacement typically costs more but has NSF certifications. The 4396508, including the OEM and aftermarket, is guaranteed compatibility with your current filter. Be sure to change twice a year or more frequently with heavy use. The 4396508 refrigerator water filter comes with free shipping and returns. .