AD 56482028 / AL 7-24-04086 Secondary Inner Safety Filter for Nilfisk Advance, American-Lincoln Sweepers, Scrubbers and Sweeper/Scrubbers. A Donaldson branded filter. This blue inner safety filter commonly works with the primary outer engine air filter, AD 56482029. This air filter is found in the engine air cleaner assembly (ex...AD 56482478). Works with GM 1.6L Petrol / Propane, Dual Fuel, and Diesel engines found in many models. Some newer Nilfisk and Advance models have a "2007 Certified Engine". This filter works on these new models. Not found on battery powered models. Fits Nilfisk Advance and American-Lincoln models: Captor Series (4300, 4800, 5400), Condor XL Series, CS7000, CR1100, CR1200, CR1300, CR1400, Exterra Series, ER1300, ER1600, Hydro-Retriever 2052, Retriever 5100 (G/P/D), Retriever 5800 (G/P/D), Retriever 6250, SC8000, SR 1800, SR 1800H, SR 1900, SW8000, and others. Please refer to your parts manual for proper application(s). One inner air filter required. Priced Each. Replaces Nilfisk Advance 56482028, American-Lincoln 7-24-04086. Our Part Number AD 56482028