Rescue essentials is pleased to introduce the new hyfin vent chest seal twin pack from north american rescue, this product sets the standard for the treatment of penetrating injuries to the chest;Two separately packaged vented chest seals are offered in one unique package for treatment of both entry/exit or multiple penetrating injuries to the chest;3-vent channels that prevent airflow into the chest cavity during inspiration while allowing air to escape through the vent channels during exhalation