AD 56505946 15" Union Mix Disc Rotary Scrub Brush for Nilfisk Advance Scrubbers. Union is a mix of natural tampico and bassine fibers which creates a soft scrub brush. This natural fiber brush can be used on decorative or polished flooring for very light cleaning and "dusting". Union brushes are also commonly used to apply waxes and polishes to wood and concrete flooring. Replaces white floor pads. These brushes have limited life as compared to their synthetic counterparts. Filament is set in a 14" diameter solid heavy duty plastic molded block. Includes 3 drive lugs mounted around a 5.53" center hole. For a stiffer natural fiber brush, give us a call and ask for bassine filament. If a softer brush is need, ask for tampico filament. Fits Nilfisk Advance scrubbers and sweeper/scrubbers including Captor 4300, 4300-AXP, Nilfisk CR 1100, CR 1100B. 3 Required Per Unit. Priced Each. Replaces Nilfisk-Advance 56505946, 505946. Our Part Number AD 56505946