The Thora-seal II chest drainage unit is a two chamber disposable, single unit chest drainage system. This is a genuine dual chamber system consisting of a water seal chamber and a separate collection chamber. This water seal chamber eliminates the increase in hydro-static pressure associated with single chamber pleural drainage systems. Features: - Clear single use vessel - Used for both gravity and suction drainage - White writable surface alongside the unit measure scales - Antifoaming feature - Bed clip for patient tube management - Sterile