10″ Water Filter Housing with 1/4″ Ports. Suitable for Reverse Osmosis, Koi Filters, Pre-Filters, KDF, Water Fed Pole Systems, Bio Diesel Filters and any other filter using 10″ cartridges. Carbon Block filter included. Filter housing fits all 10″ standard sized water filter cartridges. Can be used on its own or in a series. White, tough, food grade plastic. Tough plastic to withstand high pressure. Max working pressure 125 PSI.