AD 56487453 18" 3 Single Row Polypropylene Side Brush for Nilfisk Advance Retriever 6600XP Sweepers. 3 rows of durable polypropylene attached to a poly or marine grade wood block. 18" block diameter. For heavy duty sweeping jobs, search for 56486011 (flat wire). Fits Advance 6600XP sweepers. Replaces Nilfisk Advance 56487453, 487453. Our Part Number AD 56487453