What is a scupper?

A scupper is recognized primarily as a drainage system for flat roofs. It is designed to allow water to flow off the roof and help prevent water accumulation, which can lead to structural issues or roof damage. Scuppers are typically placed at the edge or other designated areas of a flat roof to facilitate proper drainage and ensure that excess water is efficiently managed.

Flat roofs tend to collect water due to their minimal slope, making scuppers a crucial component in maintaining the integrity of the roofing system. By directing water away from the building, scuppers play a vital role in protecting against leaks and overflow during heavy rainfall or snowmelt.

The other options focus on different functions, such as refrigerant pressure regulation, general plumbing drainage systems, and air distribution outlets in HVAC systems, each serving distinct purposes that do not align with the specific function of a scupper.