These metal conduits have an inner helically wound metal core covered by a flexible insulating sheath or coat of rubber or the like. These conduit fittings are specifically constructed and adapted to provide a liquid-tight seal and mechanical connection between the ends of the conduit. These fitting include mechanical connection and liquid-tight seal and are being affected by the same structure. These conduit fittings are available in the following categories: Electro Galvanized Conduit. PVC Coated Galvanized Conduits.