All gasoline inboard engines must have a backfire flame arrestor on each carburetor. What does this device prevent?

A backfire flame arrestor prevents flames from a backfire in the engine from escaping into the surrounding area, which could lead to a fire or explosion. It acts as a barrier that allows air to flow into the engine while trapping and extinguishing any flames that may occur during backfiring. This safety device is crucial for minimizing fire hazards in gasoline inboard engines.