What is the difference between Open and Enclosed screw pumps? A screw pump, also known as a water screw, is a positive-displacement (PD) pump that moves fluid solids or liquids along the screw axis using one or more screws. In its most basic form, a single screw rotates within a cylindrical cavity, moving materials along the screw's spindle. This ancient structure is still used in a variety of low-tech applications, including irrigation systems and agricultural machinery for transporting grain and other solids. Visit the link for more information: https://www.netsolwater.com/what-is-the-difference-between-open-and-enclosed-screw-pumps.php?blog=2208