What material is commonly used for drainage, waste, and vent (DWV) piping?

The correct choice, PVC or ABS, is commonly used for drainage, waste, and vent (DWV) piping due to several advantageous properties. Both materials are lightweight, which simplifies transportation and installation. PVC (polyvinyl chloride) is known for its corrosion resistance, cost-effectiveness, and versatility in various plumbing applications. It's especially suitable in residential and commercial settings. ABS (acrylonitrile-butadiene-styrene) is also similar and provides excellent impact resistance and compliance with building codes.

These materials are designed to handle the flow of wastewater efficiently and are easily joined using solvent cement, making them perfect for creating leak-free connections in DWV systems. Their smooth interior surfaces help in preventing clogs, further enhancing their effectiveness as drainage materials.

In comparison, while cast iron is durable and widely used for heavy-duty applications, it's heavier and more challenging to work with. Copper is excellent for water supply lines but is less favored for DWV due to its high cost and potential for corrosion over time in waste applications. Steel is also heavy and can corrode, making it less ideal for drainage systems. Hence, PVC or ABS stands out as the most commonly used materials for DWV piping systems.