 A device called the Positube, which allows for esophageal intubation detection, can be used on tube number two to rule out the intubation of the Combitube in the trachea.The Positube checks for air flow resistance on tube number two and is very helpful in checking proper Combitube placement when intubation is performed in noisy environments.The Combitube's ease of use makes it an option for use in the pre-hospital, emergency setting when advanced level providers capable of placing an endotracheal tube are not immediately available.