Pentek DGD-5005-20 / DGD-5005 Compatible Water Filter Cartridges, 4.5 x 20 Inch, 5 Micron, Dirt and Sediment Removal - by KleenWater (3) Three Compatible Cartridges for:Pentek DGD-5005-20 and DGD-5005. Pentek 20 inch "Big Blue" Works well with 3M Aqua-Pure AP810-2 and AP811-2 Perfect replacement for the Aqua-Pure AP802 housing 5 micron dirt sediment removal rating Universal 4.5 x 20 inch replacement water filter cartridge