Coaxial Breathing Circuit Adult Complete uses for Anaesthesia Machine with Sample port elbow, expiratory limb. The Adult Coaxial Breathing Circuits are PVC-Free and contain no phthalates, like DEHP. This circuit prevents common problems with added dead space and has a reduced weight of a circle system. With a single limb circuit, clutter and disorder are minimized from the anesthesia field and ICU bed while eliminating twisting of the inspiratory and expiratory limbs. In addition, the Adult Coaxial Breathing circuits provide natural heat and moisture conserving properties. Coaxial single-limb circuits designed for anaesthesia, accessories include integral gas sampling line, and APL valve for adaption to manual ventilation. Ventilator tubing.