The purpose of the double lumen endobronchial tube is used mainly to separate the two lungs. If one lung is undergoing surgery, the other lung must be ventilated to stay alive. If unilateral lung surgery or extensive alveolar lavage is performed, the left & right lung can be isolated by a double-lumen endotracheal tube. And there are blue & transparent colors help the physicians identify the left or right lung easily. Product details Disposable endobronchial Tube Dual cuffs for the bronchia & tracheal Left & right type available FR 28-FR 41