The drinking water filter fits compactly under the kitchen sink and taps directly into the cold water plumbing line for convenient access to filtered water from the existing kitchen faucet. The unit installs easily on a 3/8" cold water line using quick-connect fittings and is designed with an integrated mounting bracket for added installation ease. Plastic tubing and all installation hardware is included. Level1 - Basic filtration performance is provided by the model No. D-20 cartridge which reduces chlorine, bad taste, and odor. When the model No. D-20 cartridge reaches the end of its 12 month filter life, the consumer then has the option of choosing among several Culligan cartridges that are companions to the filter, D10, D20, D-28, D30, or D40 not included. 5 year limited warranty. Filter dimensions: 12.125" H x 4" x W x 3.75" D.