The purpose of an air gap is not really to allow air to escape but rather to keep dirty water from back flowing into the DW. An autovent allows air into the system to allow for proper drainage and an air gap is not dependant on one or vice versa. The autovent takes the place of a vent stack to the roof.
Sudan is a member of the United Nations, the African Union, the Arab League, the Organisation of Islamic Cooperation and the Non-Aligned Movement, as well as an observer in the World Trade Organization. Its capital is Khartoum, the political, cultural and commercial centre of the nation.
Eastern Sudan is referred to the area lying from Ethiopia in the East where the Kingdom of Iksum used to dominate, stretching to the region ofthe current Republic of Sudan where the Nubian Kingdom used to dominate.he name Sudan is probably a confusing term, especially to modern learners of history as it is a recent name given to the current Republic of Sudan governed by its capital city Khartoum.