What is the indicator notch on hose couplings that lines up when the threads are engaged properly?

The Higbee indicator is a critical feature on hose couplings that serves an important purpose in firefighting activities. This notch specifically aligns when the threads of the hose couplings are properly engaged. The design of the Higbee indicator helps firefighters easily and quickly identify the correct position to connect the hoses, ensuring a secure and leak-free connection.

Using the Higbee indicator improves efficiency and reliability during operations, especially in high-pressure situations where every second counts. The indicator reduces the chances of mismatching threads, which can lead to complications such as leaks or disconnections during use. Its positioning and function are essential for maintaining flow and ensuring that firefighters can effectively respond to emergencies.

In contrast, other options like the Wilt score, thread alignment arrow, and coupling alignment cross do not serve this specific function or are not standard terms associated with hose coupling engagement. The use of the Higbee indicator is a recognized practice in fire service that enhances operational safety and efficiency.