Respiratory apparatus for medical purposes to deliver air and gases to and from patients, namely, anaesthesia breathing systems comprising a breathing circuit, connections to patient, ventilator, scavenger, fresh gas delivery circuit and carbon dioxide absorber, ventilation breathing systems comprising a breathing circuit, connections to patient and ventilator, invasive breathing systems comprising a breathing circuit, connections to patient, and ventilator, non-invasive breathing systems comprising a breathing circuit, connections to patient, and ventilator, and respiratory support breathing systems comprising a breathing circuit, connections to patient, and ventilator; components as part of the aforementioned systems, namely, breathing tubes, tube connectors, oral, nasal and facial masks, nasal cannula, mouth pieces, tracheostomy interfaces, water traps, dehumidifiers for medical purposes, humidifiers for medical purposes, humidification chambers for medical purposes; parts and fittings to control the flow of respiratory gases to and from patients