A chest tube thoracostomy, which is used to drain fluids or gases from the pleural space, works because it contains a one-way valve known as a:

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A flutter valve is a one-way valve that lets gas and fluid out of a structure, but does not permit gases or fluids to return or flow backwards. A pop-off valve is a valve that releases when a specified pressure is reached.

A Chest Tube Thoracostomy, Which Is Used to Drain Fluids