External gear pumps are mechanical devices used to move fluids by using two interlocking gears. As the gears rotate, they create a vacuum that draws fluid into the pump and then pushes it out through the discharge port. These pumps are commonly used in various industries, including automotive and manufacturing, for their efficiency and reliability. The design of external gear pumps allows for a consistent flow rate, making them ideal for applications requiring precise fluid transfer. They can handle a wide range of viscosities and are often used with hydraulic fluids, oil, and other liquids. Their simple construction also makes maintenance relatively easy.