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.
And even among freed slaves, a tribute is often paid to former masters, who also maintain inheritance rights over freed slavesâ property. In Sudan, slavery is making a comeback as the result of a war waged over the past twelve years by the Muslim north against the Christians and Animists in the south. Sudan means land of the blacks in Arabic, and for centuries black Africans were abducted in Sudan as part of the Arabian slave trade.