Cleanout doors are access points installed in plumbing systems, typically found in walls or floors. They allow for easy inspection and cleaning of pipes, helping to remove blockages and maintain proper drainage. These doors are often made of materials like plastic or metal and come in various sizes to fit different pipe diameters. The primary purpose of cleanout doors is to provide a convenient way to reach the interior of drainage systems without needing to dismantle pipes. They are commonly used in residential and commercial buildings, ensuring that plumbing systems remain functional and efficient over time.