Description: Thompson Pump is an industry leader in the development of high quality engine-powered portable pumps, ranging in size from 2â??-18â??, for use in varied applications in the areas of public works, municipalities, construction, agriculture, dewatering, mining, sewer/lift stations, and water/waste water. Thompson Pump sells and rents their entire line of dewatering pumps as well as bypass systems, wellpoint systems and a complete line of pumping accessories.