Product Description The 3M Aqua-Pure Whole House Standard Diameter Water Filter Drop-in Replacement Cartridge AP420 for the AP100 & standard and large diameter Stainless Steel Housing Series, is a good choice in water filtration. This standard 2.75” diameter by 9.8” length drop-in cartridge is manufacturer tested and verified to reduce sediment down to 5 micron nominal. From the Manufacturer The Aqua-Pure AP420 filter cartridge 2 pack includes two 10-Inch long hot and cold water filter cartridges. The AP420 filter cartridge reduces dirt, rust, sediment, and scale buildup with a micron rating of 5 and a flow rate of 8 gpm. Protect your hot water heater from scale buildup while getting the clean and clear drinking water you want with a Aqua-Pure AP420 filter cartridge 2 pack.