Profile: Tru-Flo Corp. manufactures propeller type drainage & irrigation equipment. The pumps are built using A588 steel, or equal, for column and bowl assemblies to provide superior abrasion and corrosion resistance. The pump shafts are fabricated from high strength carbon steel, or stainless steel, as required. Within the center tubes, the shafts are supported on oil lubricated bronze bearings spaced on four foot centers.