A lot of tractors, bulldozers and some trucks use exhaust flappers – small metal plates that can be seen and heard flapping on top of vertical exhaust pipes. They are more common in older equipment. Do you know what the function of these flappers is?| Nodum.org
You may have noticed that some pressure gauges are liquid-filled. These measuring devices are often installed in industrial equipment, hydraulic and other systems. What is that liquid inside and what function does it perform?| Nodum.org