A sensor adaptor (20) couples a face mask (22) to a gas sampling tube (24) connected to a device detecting end-tidal carbon dioxide. The sensor adaptor (20) includes a shaft (30) and connector (54). The shaft (30) includes a channel (40) providing a pathway for the carbon dioxide to travel toward the gas sampling tube (24). One end of the shaft (30) includes an adaptor tip (26) which extends through an exit port (28) of the face mask (22). A connector (54) is attached to the other end of the shaft (30) and couples the sensor adaptor (20) to the gas sampling line. A gripper (42) may surround the shaft (30) and prevent improper advancement of the shaft (30) into the face mask (22). The sensor adaptor (20) can be designed for use with any gas sampling tube and any face mask including exit ports.
