What is a common use for PVC piping in plumbing?

PVC piping is commonly used in drain waste vent (DWV) systems due to its non-corrosive properties, lightweight nature, and ease of installation. DWV systems are essential for carrying waste water and sewage away from fixtures to the sewer or septic system while also allowing for proper airflow to maintain trap seals. PVC's resistance to chemicals and moisture helps in preventing deterioration, making it a reliable choice for these systems.

In contrast, while other materials may be more suitable for the specific requirements of hot water lines, gas supply lines, or fire suppression systems, PVC is not ideal for those applications. Hot water lines typically require materials that can withstand higher temperatures, such as CPVC or PEX. Gas supply lines need to be made from materials that meet stringent safety requirements and are usually constructed of metal or specific gas-rated plastics. Fire suppression systems often mandate the use of steel or other fire-resistant materials to ensure safety and effectiveness. Therefore, the unique characteristics of PVC align best with the needs of DWV system applications.