Gone are the days when a simple waterspout was sufficient for drainage on the parapet. Nowadays, drainage power is often required there as well. SitaVasant delivers just that. With its ultra-flat inlet pot, only 48 mm high, it only minimally interferes with the thermal insulation. A pre-built inlet pot, which forces the drainage dynamics, ensures rapid drainage performance. What is special about the SitaVasant Double is that it has an outlet with two separate inlets that function independently from each other. Main drainage and emergency drainage are combined here in one outlet and also require only one penetration in the parapet. In the event that the water level on the roof should rise to emergency drainage levels, an emergency drainage channel offset by 35 mm in height guards the roof and discharges water into a freely floodable area.