What is the function of a cleanout in a plumbing system?

A cleanout in a plumbing system serves a crucial function by allowing access to the sewer lines for cleaning and maintenance purposes. This access point enables plumbers to insert cleaning tools or cameras to clear blockages, perform inspections, and maintain the integrity of the plumbing system. Maintaining clear and functional sewer lines is essential for preventing backups and ensuring the overall health of the plumbing system.

The other options do not accurately reflect the purpose of a cleanout. For instance, insulation for pipes does not relate to cleanout functionality. Measuring water pressure and regulating water temperature involve different components within a plumbing system, such as pressure gauges and temperature control devices, and are not functions associated with cleanouts.