The W9330059 is an In-line water filter system utilizing Doulton ceramic technology with a variety of filters to choose from. It comes with an UltraCarb Candle filter but it will work with other grades of 10" candle filters with a short thread mount. Doulton W9330059 Under Sink Filter System is an Acetal/Polyester In-Line System with 3/8" Quick Connect Fittings. This Doulton HIP Under Sink Filter System is NSF Certified. The Doulton W9330059 Water Filter System Includes the housing, mounting bracket, and UltraCarb Ceramic Filter. The faucet and faucet connector are not included. The Doulton W9330059 is NOT a complete System. The Doulton W9330957 is a complete system and is available below. A fitting is needed to connect the water line to the faucet. The FQFC06W-WF fitting, available below, will connect to a 3/8" water line. 3/8" water line, PT38-10, is also available below. Doulton Ultra Carb is a highly efficient ceramic micro filter which provides genuine sub micron filtration of drinking water.