system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
All of the following are safety measures to prevent the delivery of hypoxic gas mixture to the patient except –
assistant
The correct answer is  Pin index system is to prevent incorrect cylinder attachment (not to prevent delivery of hypoxic gas mixture).
Location of important parts :-


Flow control valve and flow meter (rotameter) of oxygen should be in downstream position (most distal).
Fail-valve is located downstream from N2O and other non-oxygen gas supply source, but not downstream from O2 supply source.