ReplacementBrand RB-IN-1014Q Comparable/Universal Filter for the GE GXRTDR, Culligan IC-100 and Whirlpool 4378411 In-Line Filter Comparable to the Culligan IC-100, GE GXRTDR, and Whirlpool 4378411 Inline Water Filter Lasts for 1 year or 2,000 gallons Reduces Chlorine taste & Odor as well as sand, soil, silt, sediment, and rust. Uses Green, Coconut Carbon, Filtration Media Features Universal 1/4 inch Quick Connect (John Guest) fittings