What is the vertical water supply pipe that extends one full story or more called?

The vertical water supply pipe that extends one full story or more is referred to as a riser. In plumbing systems, risers are essential components that transport water from lower levels to higher levels in a building, often from the main water supply line. They are designed to handle high pressure and are typically larger in diameter than horizontal pipes to accommodate the vertical movement of water efficiently.

Risers play a crucial role in ensuring that water is distributed adequately throughout the various floors in a multi-story structure. Properly designed and installed risers help maintain water pressure and ensure that all outlets receive the required flow.

Other terms, while they may refer to similar structures in different contexts or fields, do not align with the specific definition of a vertical water supply pipe as recognized in plumbing codes. Hence, riser is specifically the term used within plumbing terminology for vertical supply pipes that ascend through multiple levels.