The Aqua-Pure by Cuno AP817-2 water filter replacement cartridge reduces dirt and rust up to 25 microns and reduces chlorine taste and odor, The Aqua-Pure AP817-2 features easy cartridge changeout, Aqua-Pure AP-817-2 features progressive porosity cartridges which are an industry benchmark in terms of quality and performance, The AP817-2 technology provides rigid construction that helps prevent collapse under most water pressure conditions, and a porous cylinder that traps most materials efficiently without affecting water flow, The AP817-2 water filter"s radial flow design allows for use of finer, more effective activated carbon and yields a very low pressure drop, The AP817-2"s double open ended design fits most large diameter housings, The cartridge will filter water regardless of which way it is installed in the housing, The Aqua Pure AP817-2"s neoprene gaskets on both top and bottom provide exceptional sealing in any housing, helping to prevent bypass of unfiltered water down-stream, The Aqua-Pure AP817-2 Premium Performance Filter Cartridge replaces the discontinued AP815-2 Filter Cartridge, Dimensions: 20-1/8"" L x 4-5/8"" W, 25 Micron Nominal Filtration, Flow Rate: 20 gpm, Dirt and Rust Reduction, Rigid Construction Withstands Stressful Conditions, Maximum operating temperature of 100 F, Made from FDA (CFR 21) Compliant Materials, Chlorine Taste/Odor Reduction, Polyethylene Outer Shell, PolyKLEAN Center Core, Granular Activated Carbon, SKU: CWD2181