Abstract: This invention provides a method and a noninvasive device for preventing pressure build-up in pleural space and reducing possibility of development of tension pneumothorax from open pneumothorax by providing a rigid, tubular base firmly attached to an annular flange and a noninvasive, flexible, pliable sheet with a central aperture for closing a sucking chest wound of a patient, while providing a possible path for discharging air, body fluids or any combination thereof from the pleural space of a patient. A generally flat, one-way check valve for allowing air discharge is located in the tubular base. A protective, tubular cover comprises a screening means and is used for protecting the check valve from foreign debris while allowing exit of air, body fluids or any combination thereof from the check valve and enabling visual monitoring of fluid levels within the device.