Gorman-Rupp expands its Prime Aire line to include the new PAV3B60C-3TNV70 pump. The heart of this 3-inch model uses a patent-pending vortex impeller with Gorman-Rupp’s Staggerwing design, which represents a dramatic improvement over other standard vortex impeller designs, the maker says. The design allows this model to pass a 3-inch solid through all critical areas of the pump. The PAV3B60C-3TNV70 is powered by a Yanmar water-cooled diesel engine that is EPA-certified to meet Interim Tier-4 emission standards.