These valves allow fuel to move to the low, inboard sections of the tank but prevent it from moving outboard. The wing ribs and box beam structural members serve as baffles and others may be added specifically for that purpose. When an aircraft maneuvers, the long horizontal nature of an integral wing tank requires baffling to keep the fuel from sloshing. For fuel management purposes, sometimes a wing is sealed into separate tanks and may include a surge tank or an overflow tank, which is normally empty but sealed to hold fuel when needed. Aircraft with integral fuel tanks in the wings are said to have wet wings. Integral fuel tanks in the otherwise unused space inside the wings are most common. This type of tank is called an integral fuel tank since it forms a tank as a unit within the airframe structure. The sealed skin and structural members provide the highest volume of space available with the lowest weight. On many aircraft, especially transport category and high performance aircraft, part of the structure of the wings or fuselage is sealed with a fuel resistant two-part sealant to form a fuel tank.
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