A Schlenk line is a specialized piece of laboratory apparatus used in the handling of air- and moisture-sensitive chemicals. It typically consists of a double manifold with a series of ports that allow for the simultaneous connection of multiple reaction vessels. One manifold is connected to an inert gas source, such as nitrogen or argon, while the other is connected to a vacuum pump. This setup allows for the simultaneous evacuation and refilling of reaction vessels with an inert gas, ensuring that reactions can be conducted in a controlled atmosphere.