Which of the following is NOT a hose appliance?

A hose appliance is a device that modifies the flow of water in a fire hose system. Among the options provided, a hose clamp is not categorized as a hose appliance. A hose clamp is used to stop the flow of water in a hose by pinching it closed, which is a specific function rather than a modification of the water flow like the other options.

A hose reel is designed to store and allow for easy deployment of hoses, providing convenience for firefighters. A hydrant adapter facilitates the connection between a fire hydrant and hoses of different sizes or types, enhancing the flexibility of water supply during firefighting operations. A wye is a fitting that allows one hose line to be split into two, which enables multiple points of attack with a single water source.

Therefore, the distinction lies in the function: while the hose reel, hydrant adapter, and wye are all aimed at furthering the efficiency and deployment of water in firefighting scenarios, the hose clamp serves a different purpose related to controlling water flow.