Diaphragm pumps are a type of positive displacement pump that uses a flexible diaphragm to move fluids. These pumps are commonly used in various applications, including agriculture, automotive, marine, and wastewater treatment. The diaphragm inside the pump moves back and forth, creating a vacuum to draw in and expel the fluid. This design allows diaphragm pumps to handle a wide range of fluids, including corrosive and abrasive materials, making them versatile and reliable in many industries.