The ResMed Astral single limb circuit is a breathing tube that is designed to be used with the ResMed Astral 100 and Astral 150 ventilators. It has a 15-mm smooth-bore tube and an integrated water trap to collect condensation, improving airflow stability and patient comfort. It is made from materials used in medical settings, so it provides reliable airflow with low resistance. It also connects easily via a valve that makes it simple to exhale. This circuit is used in hospitals, ICUs, emergency departments, rehabilitation centers, and for home care to help people breathe well in cases where they need to be ventilated for a short time or a long time.