What is a disadvantage of using nonthreaded couplings?

• A. Hose can become suddenly and violently uncoupled.
• B. Hose can be deployed from either end.
• C. There is always a risk of cross-threading.
• D. Fire hose cannot be connected quickly.

Answer: (A)

Nonthreaded couplings are designed for fast, tool-free connections, which is why they’re valued on the fireground. The trade-off is security under pressure: without threaded engagement to lock the connection rigidly, a coupling can come apart if it isn’t fully seated or if the hose is subjected to movement, kinks, or tension. When that happens, water can be released abruptly, causing the hose to disconnect suddenly and violently. The other aspects—deploying from either end and quick connections—are advantages of nonthreaded designs, while cross-threading isn’t a concern since there are no threads to misalign.