The Big Brand Water Filter XL234 Filter housing accepts three 20” slimline filters with double open ends. The housing features a 2” inlet and 2” outlet connections. You will note in the picture on this page we show the housing with threaded and flanged connections. We can custom make this housing in a variety of configurations. The standard configuration is 2” female NPT three 20” cartridge setup. We can custom make it to accept up to 7 cartridges and even use 222 oring style filters. There may be a minimum quantity requires for custom made housings. Viton oring, flanged connection and other options are available on request.