Check all breathing systems that are to be used and perform a ‘two-bag test’ before use, as described below [9]. Breathing systems should be inspected visually and inspected for correct configuration and assembly. Check that all connections within the system and to the anaesthetic machine are secured by ‘push and twist’. Ensure that there are no leaks or obstructions in the reservoir bags or breathing system and that they are not obstructed by foreign material. Perform a pressure leak test (between 20 and 60 cmH2O on the breathing system by occluding the patient-end and compressing the reservoir bag
