MESCO manufactures GFMC to UL 1 and ANSI C80.3 standards, in trade sizes from 1/2" through 4", from hot-dip galvanized low-carbon steel strip with a minimum zinc coating weight of 275 g/m² (G90 / Z275). The result is a product that does what flex conduit is supposed to do — flex reliably, resist corrosion, and last.