Fits Whirlpool WHKF-DB1 Undersink Water Filter Compatible Cartridges 3 Pack by CFS Comptible to Whirlpool WHKF-DB1 Undersink Water Filter Compatible Cartridges 3 Pack by CFS Three 2.5 inch (w) X 9.75 inch carbon block water filter cartridges. 5 Micron Removes chlorine, enhances tastes and improves health. "High quality - low cost" alternative. Constructed of NSF approved materials. .05 micron dirt / sediment filtration.