Specifies non-interchangeable connections for large medical oxygen and nitrous oxide cylinders to comply with AS 2473. For medical oxygen contained in cylinders greater than 5 kg water capacity, Types 10 and 10.5 connections will be used; for all other medical gas cylinders pin-indexed outlet connections are to be used. As the diversity of demands are exhausted for single-pin indexing, double-row pin indexing will be introduced. This Standard introduces pin-indexed connections for all medical nitrous oxide connections, in order to prevent the potentially dangerous connection of industrial carbon dioxide to medical nitrous oxide applications.