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ATP offers a complete line of hopper car covering systems that can include trough and 30-inch round covers made of FRP composites, aluminum or steel, brackets, batten bars and installation fixtures. Available options include systems without batten bars, right and left opening trough covers, food grade gaskets, stainless steel hardware, and round covers with optional two-point hinging and a built-in cambering device that permits the adjustment of the round cover to meet a warped coaming.