Double Diaphragm Pumps are driven by Compressed Air, designed for use in applications requiring large volume transfer in a very short time. These pumps can transfer contaminated media & are good at cleaning out pits or liquids that can be a mix of several products like oil, water and antifreeze all mixed together. Handles a wide variety of fluids with high solids content: No close fitting or rotating parts so liquid with high solids content andor size can be easily pumped.