For crush and corrosion resistance, Heyco-Flex VI Liquid Tight Electrical Conduit features PVC-jacketed, continuously interlocked hot dipped zinc galvanized steel core. It is approved for both exposed and concealed locations, direct burial and in concrete. Heyco-Flex VI Liquid Tight Conduit Fittings, made of nickel-plated brass, come in straight-through and 90° sweep styles with NPT hubs. Corrosion-resistant fittings have insulated throat to prevent wire damage during installation.