DuPont WFDW120009W Universal Drinking Water Filtration System Includes one Universal 2000 Series Carbon Block Filter Cartridge; certified chlorine reduction and improved taste Easy to install to a drinking water faucet or direct to your kitchen faucet. Filters up to 1,000 gallons for long undersink water filter life Universal system designed to accommodate all DuPont Universal Drinking Water Cartridges Includes pressure relief valve