The H*Vent is an occlusive hydrogel chest seal that is a compact and low-profile. Its H*VENT system is designed to relieve pressure in an open chest wound caused by air in the pleural cavity (pneumothorax) or bodily fluid (hemothorax). The unique H*VENT design allows fluids to drain in multiple directions, towards gravity. This allows for patient transport in a variety of positions (on their side, etc.). This innovative system includes 6 individual vents, which means even if some become blocked, as long as one is functional it will work as intended. A dome-shaped membrane ensures a complete seal around the wound. This provides easy visual monitoring - the dome billows up if air or fluid are leaving the chest, and is sucked down when the seal is in place. Internal testing has proven that the seal is retained during inhalation and a continual negative pressure is sustained (below ambient pressure) within the pleural space.