The carpet insert is an accessory for cleaning carpets. It is easily attached to the extension tube and emits steam onto the surface of the carpet, helping to loosen up stains and dirt. Using steam can help to eliminate tough stains such as grease, mud, ink, dirt, juice, food stains, and much more. This product is only compatible with the 500, 1000, 3000, and 5000 KleenJet® steam cleaner models.