UnderwaterSealDrainage

 A Chest Bottle (Underwater Seal Drainage System) is a three-chamber disposable device used to drain air and fluid from the pleural space via a chest tube. Its critical component is a water seal chamber that acts as a one-way valve, preventing air from re-entering the chest while allowing drainage. It is used to treat pneumothorax, hemothorax, and pleural effusions, and is mandatory post-thoracic surgery. The system must always be kept upright and below the patient's chest level. It provides essential clinical information through tidaling in the water seal (indicating tube patency and lung expansion) and bubbling (indicating an air leak), making it both a therapeutic and diagnostic tool.