The Culligan US-600A drinking water filter system fits compactly under the kitchen sink and taps directly into the cold water plumbing line for convenient access to filtered water from your existing kitchen faucet. The unit installs easily on a 3/8-inch 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 are included. Basic Filtration performance is provided by model D-20A cartridge (12-month capacity) which reduces aesthetic chlorine taste & odor and bad taste & odor. Other Culligan replacement cartridges options available: D-10A, D-30A, or D-40A.