If a nozzle with a threaded connection is being used, it must be firmly attached and properly threaded before beginning any filling process.

• A. False
• B. True
• C. Not required
• D. Only if pressure is high

Answer: (B)

A threaded nozzle must be firmly attached and properly threaded before filling because a secure seal is essential to prevent propane leaks. If the connection is loose or cross-threaded, gas can escape through the threads, creating a flammable vapor cloud and a real fire or explosion risk during the fill. Properly engaging the threads, using the correct tool to tighten to the specified specification, and checking for leaks afterward ensures a safe, controlled fill. This requirement applies at all pressures—there’s no situation where a loose connection is acceptable.