Replacement 5-Pack iRobot Roomba 620 3-Arm Side Brush - For iRobot Roomba Robotic Vacuum Parts Replacement iRobot Roomba 620 3-Arm Side Brush The Brush allows your Roomba to reach deeper into the carpet for a more thorough cleaning Replace side brush every 2 to 3 months for best performance For Newer Version of the Roomba 620. Please check your Roomba to make sure you are purchasing the correct parts On Sale for a Limited Time!