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WARD bushings are produced in malleable iron-grades. All bushings and plugs produced by WARD are manufactured to ASME B16.14 specifications and threaded to ASME B1.20.1 standards. Hex bushings and cored plugs can be used for class 125 and class 150 systems, while face bushings and solid plugs should be installed on class 250 or class 300 systems.