What is the definition of a plumbing system's "cleanout"?

A plumbing system's "cleanout" is defined as an access point for cleaning out the drainage system. This access point is crucial in maintaining the integrity and functionality of the plumbing system, as it allows plumbers to clear obstructions or perform maintenance without having to dig up pipes or disrupt the entire system. Cleanouts are typically installed at specific locations in the drainage system, such as at bends or changes in direction, to facilitate easy access for unclogging and cleaning.

By providing direct access to the interior of the drainage pipes, cleanouts ensure that blockages can be removed efficiently, thereby minimizing the risk of backups and maintaining the overall health of the plumbing system. The design and placement of cleanouts are governed by plumbing codes, which dictate how often they need to be installed based on the length and layout of the drainage lines.

The other choices provided do not accurately describe a cleanout's function, highlighting its distinct purpose in plumbing maintenance.