The rotating brush (rotates in reverse direction), raises loose material from inside of the joint, such as slurry or small stones, to the front. The result is a largely dust-free joint, which forms the basis for the durability of the sealing compound to be poured into the joint in the next step.
The RSB 120 is equipped with a two-stage air filter which effectively prevents the penetration of dust into the motor.
The filter cartridge can be replaced without tools.