AIR FILTER Compatible Nilfisk Vacuum Cleaner Models: Attix 590-21, Attix 751-2M, Attix 751-11, Attix 751-21, Attix 791-21 EC, Attix 40-01 PC, Attix 40-21 PC, Attix 50-01 PC MEASUREMENTS: Outer diameter 185 mm , Inner diameter 145 mm , H 140 mm Reference Code (RAT.): 21-801 Original Code: 42160 Nilfisk