Pro-Tec Engineered Buildings Sioux Steel Co. Protect and cover your bunker storage permanently Sturdy, durable gable truss building Single tube, truss arch, sentry series and gable style options available Economical cost/bushel Request More Info Fill out the form below to request more information aboutPro-Tec Engineered Buildings More From Sioux Steel Co. Court upholds Sioux Steel's patent infringement verdict Prairie Land Millwright Services' was found to have willfully infringed on Sioux Steel’s patent for grain bin paddle sweeps. Cornado Grain Spreader Designed to handle up to 8,000 bushels/hour DPS G2 Commercial Grain Systems FlexStor Grain Bag Loading and Unloading System FlexStor AugerVac GPS (Grain Push System) 12- to 36-foot Hopper Bins Pro-Tec Engineered Buildings DPS 12K Dust Suppression Hopper