A plumbing cleanout is an accessible point in a drainage system designed to provide easy access for clearing clogs or inspecting the pipes. Typically located along the main sewer line or near plumbing fixtures, cleanouts are capped openings that allow plumbers to insert tools like drain snakes or hydro-jetting equipment without dismantling the system. They are essential for maintaining the flow of wastewater, diagnosing blockages, and preventing damage to the plumbing system. Cleanouts help save time and reduce costs during maintenance or repairs.