The insert squeegee/brush attaches to the floor tool and is locked in place with yellow latches. The insert squeegee/brush is used to pick up embedded dirt and grease using a combination steam, brush, and vacuum action. This insert should always be used with the brush in the front and squeegee in the back. This accessory can only be used with the 500, 1000, 3000, and 5000 series of KleenJet® steam cleaners.