FC 40-521P 38" 18 Single Row .030" Polypropylene Cylinder Sweep/Scrub Brush for Factory Cat 420, 430 Riding Floor Scrubbers. An economical alternative to the soft Nylon brushes, the poly scrub brushes are great for general duty scrubbing tasks on almost all flooring surfaces. The small .030" diameter poly reaches into cracks and grout lines. These can be used on sealed and unsealed concrete, polished concrete, older painted and epoxy painted flooring, tile and most stone surfaces. Usually white, black or blue in color. 38"L x 9"OD. Fits Factory Cat 420-C and 430-C cylindrical scrub brush riding scrubbers. Some units (420, Disc) require two 22" disc brushes instead of cylinder brushes (use two 23-421P, .028" Poly disc brush - 21" block diameter - also not offered by Factory Cat). Please check your unit before ordering. Two cylindrical brushes create a 42" wide scrubbing path. Two brushes required. Priced each. Not currently offered by Factory Cat. Our Part Number 40-521P