Definition
A riser main is a primary vertical water supply pipe in a building, especially in multi-story buildings. It distributes water from the main water source to different branches or floors. It's essentially the backbone of the building's water distribution system. The riser main ensures adequate water pressure and flow to all levels. Without it, upper floors might suffer from low water pressure. Think of it as the central trunk of a water-providing tree, reaching all the branches. π³