SmalLine is the industry leader for innovation in manufacturing a line of high quality, extremely heavy duty, high capacity, high performance pumps, with longevity. Double diaphragm pumps range in size from 4 to 6 inches and they pump anything from clear water to the murkiest of sludge. Our pumps have served for years in the fields of construction, mining, excavation, plants and refineries, equipment rental, and fluid remediation. Check out our Products and Support page to see the details.