What type of connection do small cylinders utilize in the Pin-Index Safety System?

The Pin-Index Safety System (PISS) is specifically designed for small gas cylinders to prevent the incorrect connection of gas cylinders to their regulators. The system employs a yoke type connection, which features pins that correspond to specific gas types. Each gas has a unique arrangement of pin placements on the cylinder, allowing regulators designed for that gas to be securely fitted while preventing the attachment of regulators for other gases.

This design helps ensure safety by minimizing the risk of accidental gas mix-ups, which could lead to severe safety hazards. The yoke type connection is not only secure but also enables a straightforward attachment and detachment process, essential for users who need to rapidly switch between cylinders in medical settings.

This design contrasts with other connection types, such as plug, screw, or bayonet connections, which do not provide the same level of safety and specificity needed in medical gas applications. Therefore, understanding the yoke type connection's role in the Pin-Index Safety System is crucial for safe practices in medical gas storage and usage.