AD 56505944 15" .028" Poly Disc Rotary Scrub Brush for Nilfisk Advance Scrubbers. 028" diameter polypropylene filament for general, medium duty scrubbing jobs. Polypropylene filaments will not damage painted or epoxy painted flooring. If a softer brush is needed, look to the .022" soft poly brush (56505945). Equivalent to Prolene. Commonly black or blue in color. Replaces blue or green floor pads. Filament is set in a 14" diameter solid heavy duty plastic molded block. Includes 3 drive lugs mounted around a 5.53" center hole. We also offer a lighter poly (Prolite) brush, use AD 56505945, .022" diameter poly for sensitive floors. 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 56505944, 505944. Our Part Number AD 56505944