Hamilton Coaxial Breathing CircuitsHamilton Coaxial Breathing Circuits 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