Pressure Flow (Siphon) Roof Rainwater Drainage System, commonly referred to as the siphon drainage system or siphon rainwater system, utilizes the potential energy from the height difference of the building, the scientific design of the special siphon rainwater head, and the reasonable layout of the pipeline system to rapidly discharge roof rainwater. The distinct difference between the pressure flow roof drainage system and the traditional gravity flow drainage is that the traditional gravity flow drainage requires a certain slope for the drainage pipes to discharge rainwater, and the presence of air in the pipes leads to slower drainage speeds and the need for more drainage stacks. In contrast, the pressure flow (siphon) drainage uses horizontal pipe laying, has no slope in the drainage transverse pipes, requires fewer drainage stacks, and offers rapid drainage!