Pin index of oxygen is: March 2005: (A) 0, 5, (B) 1, 5, (C) 2, 5, (D) 3, 5 Laughing
Answer is C. Ans. C: 2, 5 A gas-specific pin-index system is provided on small cylinders: pins on the yoke of the anaesthetic machine mate with holes drilled in specific positions on the valve of the cylinder to provide a mechanical means of preventing incorrect connection. Index positions: Oxygen 2 and 5 Nitrous oxide 3 and 5 Air 1 and 5.