Specifies basic requirements for breathing attachments for anaesthetic apparatus, including the sequence and dimensions of cone and socket joints (conical fittings) of 15 mm, 19 mm, 22 mm, 23 mm and 30 mm sizes, used for adult and paediatric purposes. Dimensions and form of screw-threaded, weight-bearing connections for use with attachments for anaesthetic apparatus and ventilators are also specified.