AP810, AP801 - Aqua-Pure - Compatible Water Filter Replacement Cartridge - 4 1/2 X 9 7/8 Inch - 5 Micron - by KleenWater with AP801 Oring Compatible replacement for 3M Cuno Aqua-Pure AP810 / AP801, Whirlpool WHKF-GD25BB 5 micron whole house water filter with dirt sediment and rust filtration Raised Groove polypropylene construction Plastic End Caps with gaskets ensure positive seal 20 gallon per minute flow rate ideal for "point of entry" installation