FC 25-521N 25" 18 Single Row Soft Nylon Cylindrical Scrub Brush for Factory Cat / Tomcat Scrubbers. Soft .014" diameter Nylon filament for light duty scrubbing of polished concrete, marble, newer epoxy painted flooring or any other senstive flooring. Equivalent to Nylon, Nylex. Fits Factory Cat and Tomcat 26, Magnum 27, GTX 27, 2600C, and 290C scrubbers which require two 25" cylindrical scrub brushes (Listed as a 27 Inch - 27" scrub path with brush overlap. 290C listed as 29" scrub path with overlap). These are the OLD style scrub brushes with the slotted drive system (newer style is a "star" drive with six notches). These are for units with serial numbers BELOW 50000. Please check your unit before ordering. Two brushes required per unit. Priced each. Replaces Factory Cat / Tomcat 25-521N. Our Part Number FC 25521N