Mechanicals · definition
The black (ABS) or white (PVC) plastic pipe used for modern drain and vent lines. Local code dictates which is allowed.
Source: Charlotte Pipe — ABS and PVC DWV Plumbing Systems
Where this term lands on a Columbus budget
The cost pages carry the current local ranges, and the guides explain what moves them. A published range becomes a project number only after someone looks at the site.