Doulton W9330958 SuperCarb Under Sink Filter System Doulton W9330958 Under Sink Filter System is an Acetal/Polyester In-Line System complete with Installation Kit with 3/8-Inch Push-fit connectors This Doulton HIP Under Sink Filter System comes complete with a Doulton SuperCarb Ceramic Filter Candle and features a durable plastic housing The Doulton W9330958 Water Filter System connects easily under the sink and includes all parts needed for a standard installation