A large metallic device, mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached), designed to prevent the passage of a rapidly moving flame through the piping is called a __________.

Correct Answer: Option B — detonation arrestor

A detonation arrestor is specifically engineered to stop a high-velocity flame front or detonation wave within a piping system. Unlike standard flame screens, these heavy-duty devices are required in vapor control systems to mitigate the extreme pressures associated with rapid flame propagation in flammable vapor lines.