What type of copper tube and fittings must be used for drainage and vent piping installed above ground?

For drainage and vent piping installed above ground, the appropriate choice is Type DWV copper tubing and fittings. DWV stands for "Drain, Waste, and Vent," and this specific type of copper tube is designed to withstand the pressures and conditions typically found in drainage systems. It is not as heavy or thick as Type K or L, which are intended for higher-pressure applications. Additionally, DWV copper tubing is treated to resist corrosion and is suitable for the varying temperatures associated with waste removal.

Copper Type M, while it can also be used in plumbing applications, is not specifically designed for drainage and vent piping and may not meet the required specifications for such uses. Therefore, Type DWV is the standard for this application, ensuring both compliance with plumbing codes and reliable system performance.