Question 356Motor Plants - Assistant Engineer

The correct answer is D) "26". The device used to prevent overpressurization of the illustrated distiller is a pressure relief valve, which is typically labeled as item "26" in distiller system diagrams. This pressure relief valve is a safety mechanism that opens to release excess pressure and prevent the distiller from becoming overpressurized, which could lead to a dangerous situation. The other answer choices, such as "12", "13", and "19", represent different components of the distiller system, but they do not specifically function to prevent overpressurization.