Pin index system for nitrous oxide:
Ans: (c) 3,5Ref: Miller's Anaesthesia 7th ed. / 675GasColor CodePin index positionBodyShoulderOxygenBlackWhite2,5Nitrous oxideBlueBlue3, 5CO2GrayGray1,6HeliumBrownBrown2,5AirGreyWhite/black quartered1,5
1,6
2,5
3,5
1,5
Local and Regional Anesthesia