Portex Low Dead Space Connector with Sideport, 3.5mm || Product Usage: The connector is used to attach the endotracheal tube to the patient breathing circuit. The low dead space connector minimizes mechanical dead space and subsequent carbon dioxide rebreathing. The connector's sideport permits access for administration of artificial surfactant, airway pressure monitoring, gas sampling, and instillation of sterile saline for airway leakage.