A scupper guard is a protective device designed to prevent debris, dirt, and other materials from entering and clogging scuppers. Scuppers are openings in the sides or bottom of a boat, ship, or building that allow water to drain away from the area. They are commonly found on decks, roofs, and other surfaces where water can accumulate and create a hazard. Overall, scupper guards are an important component of any drainage system, as they help ensure that water can flow freely and prevent damage to boats, ships, and buildings.