What type of connectors are used in the QUICK CONNECT system?

The QUICK CONNECT system utilizes specifically shaped connectors for each type of medical gas. This design ensures that only the correct gas can be connected to the appropriate device, which is crucial for safety in medical settings. Such specificity in connector shapes prevents the risk of mixing up different gases, which could lead to dangerous situations. By having unique shapes for each gas, medical professionals can quickly and confidently connect the appropriate gas source to the device being used, ensuring that patients receive the correct treatment with minimal risk of error. The other options do not provide the same level of safety or specificity needed in medical environments.