Gravity emergency roof drain DN75 vertical, with height-adjustable emergency flap, with a steel twisted ring HL62SAFE/7

The drain is designed for gravity emergency drainage of roofs. As a building protection in the event of excessive rainfall and no water drainage through the main roof drainage system. Emergency drainage made as a separate water drainage system, e.g. to the area adjacent to the building, cannot be included in the roof drainage system. Flow-catalog / www.hl.at DN75 socket joint or compensation socket of a given producer of HDPE welded system.