What is a "cleanout" in plumbing and where is it required?

A cleanout in plumbing is an access point that allows for the maintenance and cleaning of drains and sewer lines. It is essential for facilitating the removal of clogs and ensuring the system remains free-flowing. The requirement to install cleanouts at intervals of no more than 50 feet is in accordance with plumbing codes, which help to ensure that plumbing systems are accessible for service and maintenance purposes.

This access point can be crucial for plumbers to clear blockages effectively without the need for dismantling sections of the piping. By installing cleanouts at specified intervals, it also helps to prevent major disruptions in the plumbing system, ensuring that blockages can be addressed efficiently.

The other options do not accurately describe the function or requirements of cleanouts in plumbing systems. An exit point for wastewater refers to where sewer lines discharge, while a vent for gas escape and a shut-off valve serve entirely different purposes in plumbing systems.