This cushion is only for the AirFit F30i Interface. This unique cushion is practical a hybrid between a nasal and full-face interface making it in a league all its own. It comfortably fits underneath the nose and vents air into the user's nasal passage. However, it still fits over the patient's mouth. Side sockets allow for easy connection with the interface frame (not included). Simply click the cushion into place and you are ready for a good night's sleep!