AD 56505836 15" Union Mix Rotary Disc 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. These brushes have limited life as compared to their synthetic counterparts. Filament is set in a 15" diameter solid heavy duty plastic molded block. Includes 3 mounting drive lugs. Fits Nilfisk Advance scrubbers including Condor 4530D (with 45" scrub deck option), Warrior 32D, Warrior AXP, Warrior ST (32" Disc Models), BA 855, Convertamatic 32D, Advenger 3210D, Advenger 3120D-AXP, BR 800S, BR 800S EDS, Adgressor 3220D, Adgressor 3220D-AXP, BR 850S, BR 850S EDS, Mobilmatic 64, Mobilmatic 6400, Condor XL / CS8000 (Side Scrub Brush). These brushes have a 5-1/2" center hole. Many machines require two, or in some cases, 3 or 4 brushes. Please check your machine before ordering. Often listed as 16". Replaces Nilfisk-Advance 56505836, 505836.