What is the primary use of the Diameter-Index Safety System (DISS)?

The Diameter-Index Safety System (DISS) is specifically designed for low-pressure gas connectors. This system ensures that different types of medical gases are safely and correctly connected to their delivery devices by utilizing unique diameter fittings that prevent the intermixing of gases. Each gas has a specific fitting size that corresponds to its designated application, thus minimizing the risk of delivering the wrong gas to a patient.

In the context of respiratory care, the DISS is particularly important in applications where precision and safety are paramount, such as when connecting oxygen or nitrous oxide to various medical devices. The other options are either related to high-pressure systems, which use different safety mechanisms like the American National Standards Institute (ANSI) gas cylinder standard, or refer to systems that do not utilize the DISS framework, making the option focused on low-pressure gas connectors the most appropriate choice.