Illinois Plumbing Code Practice Exam 2025 – All-in-One Guide for Exam Success!

The function of a cleanout in a drainage system is to provide access for cleaning and maintenance of the pipes. Cleanouts are strategically located along drainage lines to allow plumbers to easily remove blockages and debris that may accumulate in the piping. This access point is essential for ensuring the efficient operation of the drainage system and for performing routine maintenance without having to dismantle large sections of the plumbing. By facilitating easy access, cleanouts help in preventing more serious issues that could arise from neglected maintenance, such as backflows or leaks.

The other options address different aspects of plumbing systems. For instance, protection against backflow, which refers to the prevention of wastewater entering the clean water supply, is accomplished through backflow prevention devices, not cleanouts. Stabilization of the plumbing structure and dispersing excess water from the system are also functions carried out by different components of the overall plumbing system, such as pipe hangers and drainage basins, rather than cleanouts.