For what purpose is a cleanout used in plumbing systems?

A cleanout is an essential component in plumbing systems specifically designed to provide access to the piping for maintenance purposes, particularly for clearing blockages. This access point allows plumbers to insert tools or cameras into the piping system to remove clogs, perform inspections, or conduct maintenance without having to dismantle the entire plumbing infrastructure. The cleanout can be situated at strategic points within the drainage system to ensure that any potential buildup or blockages can be efficiently addressed, facilitating smooth operation of the plumbing system.

The other options do not accurately describe the function of a cleanout. For instance, while cleanouts can be beneficial during pipe installation or when connecting pipes, their primary function revolves around providing access for maintenance and unblocking, rather than being used as a tool for measuring diameter or serving as a point for everyday connections between pipes.