The Culligan Direct Connect Under Sink Water Filtration System For Culligan US-DC1 is a great way to have clean, filtered water at your fingertips. It connects directly to your cold water line and features a twist-on, twist-off cartridge design for easy hassle-free cartridge change, quick-connect fittings, and double water shut-off. The filters are easy to change and reduce bad taste & odor, aesthetic chlorine taste & odor, and sediment right from your kitchen faucet. The US-DC1-R cartridge has a life of 6 months or 3,000 gallons. The package includes a filter head with a built-in bracket, US-DC1-R Basic Filtration cartridge, and mounting screws. The US-DC1 is certified by IAPMO R & T and has a 1-year limited warranty.