A Bain Circuit Adult is a type of breathing circuit used in anesthesia and respiratory care for adults. It's a semi-open system that allows for the delivery of anesthetic gases and oxygen to the patient while also removing exhaled gases and waste products. This consists of a long, flexible,corrugated tube made of a lightweight material like plastic. It's usually transparent, allowing healthcare providers to visually monitor the flow of gases. Bain Circuit Adult is often used in adult patients undergoing general anesthesia for surgery. They offer advantages such as low resistance to gas flow, minimal dead space, and the ability to provide a reliable supply of anesthetic gases while effectively removing exhaled gases.