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.
Sudan (Jumhuriyat ad-Dimuqratiya as-Sudan) is the widest African state, situated in the North-East Africa. The natural space of Sudan is characterized by tropical forests, steppes and savannas, but there are also a lot of lakes and rivers in the Southern areas; in this region, the fish is the most frequent meal.