LEGISLATORS yesterday proposed breaking the monopoly on oxygen supply. The move came after Hong Kong Oxygen admitted supplying incorrectly labelled medical cylinders due to human error. Following a report to the Fire Services and Health departments, the firm yesterday submitted its inquiry report to the Legco health services panel. It said key individuals had failed to carry out their duties 'in a fair and reasonable manner'. Disciplinary action ranging from written warnings to dismissals had been taken against staff involved. The United Christian Hospital and St Teresa's Hospital discovered in January that four cylinders labelled 'medical air' contained carbon dioxide. Medical representative Dr Leong Che-hung said the Government should import overseas suppliers. But Deputy Secretary for Health and Welfare Doris Ho Ko Suet-yiu said she feared Hong Kong was not attractive enough to outside suppliers.