Suggested Level of Knowlege: Detailed
LOs
BT_SQ 1.10 Describe the supply of medical gases (bulk supply and cylinder) and features to ensure supply safety including pressure valves and regulators and connection systems
References
Al-Shaik & Stacey has some details on the pin index system.
Ward briefly mentions the pin index system in Chapter 1.
Russell also covers the pin index system.
Pin Index System