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Calder Rail manufactures trough and round fiberglass hatch covers that are light weight, strong and durable. We can provide any dimensions or diameter for any application including food grade and corrosive applications. We use specially made racks and gauges to assure that all components are adequately manufactured and assembled on our Hatch Covers. To guarantee hermetic seal on our hatch covers, we use a Quality Assurance Test Rack, where covers are tested.