Roofwater siphon, also known as siphon drainage system, siphon roof rainwater drainage system, or pressure flow roof drainage system. It isRelying on the unique design of the rainhead, air-water separation is achieved, keeping the rainwater vertical pipes full. When the water in the pipes reaches a certain capacity, suction begins. During the rainfall, the continuous suction action enables the entire system to rapidly drain roofwater at an astonishing speed. The most critical component of the rainwater suction system is the suction rainhead, as its performance and design are crucial for the system's effectiveness. Additionally, high standards are required for the quality and installation of the suction drainage pipes and fittings, as they are vital for ensuring the system's proper operation and longevity.