Which of the following trades aligns and installs drain, waste, and vent piping?

The role of a plumber is specifically centered around the installation and maintenance of water supply and drainage systems. This includes working with drain, waste, and vent piping, which is critical for ensuring proper sanitation, drainage, and ventilation in residential and commercial buildings. Plumbers are trained to align these pipes correctly to avoid leaks and ensure that the waste is efficiently directed away from the premises.

Carpenters typically focus on constructing wooden structures and frameworks, while electricians work on electrical systems, and drywallers are involved in finishing interior walls and ceilings. None of these trades deal with plumbing fixtures or piping systems in the way that plumbers do. Therefore, the task of aligning and installing drain, waste, and vent piping falls squarely within the expertise of a plumber.