For every dispenser transfer hose application, a _______ hose-end valve is a code requirement.

• A. Quick closing
• B. Ball
• C. Gate
• D. Check

Answer: (A)

The safety principle here is rapid automatic shutoff of propane flow at the hose end during a transfer. A quick-closing hose-end valve is required so that if the nozzle is disconnected or a leak occurs, the valve closes almost instantly, minimizing the amount of propane released and reducing the risk of fire or hazardous exposure. This fast response is what makes it the appropriate choice for every dispenser transfer hose application. In contrast, a ball or gate valve is typically a manual valve and may not close as quickly or automatically in a hose-end setup, and a check valve only prevents backflow but doesn’t automatically stop forward flow when the hose is disconnected.