If you need to replace several DSL/U-verse filters, this is the item for you. Please note, AT&T suggests not to connect more than 5 analog devices (phones, faxes, etc.) at one time. Single Port DSL/U-verse Filter for telephone or analog device using telephone service. 2Wire Dual Port DSL/U-verse Filter for modem or gateway location. Part number - 1001-301000-004.