An important part of the Roomba are the brushes that kick dust and dirt loose from the carpet so it can be picked up by the air stream. The end caps that hold the brush in place may need to be changed occasionally.
iRobot manufactures the replacement end caps situated at both ends of the brush that hold the brush in place. This listing is for a 6 pack of replacement end caps for your iRobot 400 series floor cleaning robot.
