The Certified Model S Pile Brush takes up deep embedded particulates from the carpet fibers while simultaneously grooming the nap. Helps to eliminate traffic patterns and prolong carpet life. The Model S is equipped with a dual-motor system. One motor drives a 4" nylon-brush, while the other propels the vacuum motor. Comes standard with a sand trap that collects larger-sized bits, while the vacuum pulls up finer particles into the shake-out bag. An essential tool for the professional carpet cleaner.