A hollow tubular device made of durable materials (e.g., rubber, silicone) intended to be used to conduct breathing gases during the respiratory cycle, typically during anaesthesia or ventilation. It is intended to function as part of, or in association with, a breathing circuit or other gas delivery device (e.g., respiratory mask) and/or connect to a breathing bag or ventilator. It may be used as a gas pressure line. This is a reusable device intended to be cleaned/disinfected prior to use.