The vertical DWV main extending through one or more stories is called a _______.

The term "stack" refers specifically to a vertical drain, waste, and vent (DWV) pipe that extends through multiple stories in a building. It serves the crucial function of transporting waste and venting gases safely from fixtures to the building's drainage system. This vertical configuration helps maintain proper airflow and pressure within the plumbing system, ensuring efficient drainage and preventing sewer gases from entering the living space.

When considering other options, "pipe" is a more general term that applies to any section of pipe within the plumbing system, but it does not specifically denote the vertical arrangement or its function in the DWV system. "Column" typically refers to structural elements in construction and does not pertain to plumbing. "Vent" refers specifically to the part of the plumbing system designed to allow air to enter and relieve pressure but does not encompass the entirety of the vertical DWV system. Therefore, "stack" is the correct designation for the vertical DWV main due to its specific function and structure.