#107402646, Filter Cage/Filter Frame, Attix (old #302000472). This will fit all Attix 8 gallon models (also called Attix 3 series), and all Aero 21/26/31 models, Attix 30/50, Attix 12 and 19 gallon models (also called Attix 5 and 7 series models) which do NOT have the XtremeClean Self Cleaning Filter system.  Filter fits over cage/frame, and cage/frame screws on to hold filter on.

#107402646, Filter Cage/Filter Frame, Attix (old #302000472). This will fit all Attix 8 gallon models (also called Attix 3 series), and all Aero 21/26/31 models, Attix 30/50, Attix 12 and 19 gallon models (also called Attix 5 and 7 series models) which do NOT have the XtremeClean Self Cleaning Filter system. Filter fits over cage/frame, and cage/frame screws on to hold filter on.