AIR FILTER Compatible Nilfisk Vacuum Cleaner Models: EC380-E, turbo XL, turbo XL25, SQ550-11, SQ550-21, SQ550-31, SQ650-11, SQ651-11, SQ690-21, SQ690-31, ST10, ST15, ST20, ST25, ST35E, aero 400, aero 440, aero 5 Gallo, aero 600, aero 640, aero 7 Gallon AS/E, aero 800A, aero 840A MEASUREMENTS: Outer diameter 185 mm , Inner diameter 145 mm , H 140 mm Reference code (RAT.): 21-800 Original code: 42160 NILFISK