What does a riser serve in a plumbing system?

A riser in a plumbing system is primarily designed to facilitate the vertical transportation of water supply within a building. Essentially, it is a vertical pipe that carries water upward from the main supply line to various branches that distribute water to different fixtures on each floor, such as sinks, showers, and toilets. This component is crucial in ensuring that each level of a multi-story building has adequate access to fresh water.

The function of a riser is specific to the distribution of water, distinguishing it from other plumbing components that might deal with drainage, waste disposal, or ventilation. While drainage systems manage the removal of wastewater and vents maintain airflow within plumbing systems, the primary role of a riser is to serve as the conduit for water supply, making it integral to any plumbing system that requires vertical water flow.