Goodluck RIGID CONDUITS are hot dipped galvanized both inside and outside. The rigid conduits are threaded both ends with state-of-the-art Automatic threading machines and supplied with UL approved couplings on one end and other end protected with color coded plastic thread protection caps. The external and internal surface of the conduits is hot dipped galvanized and then a clear anti- corrosion coating is done for higher protection against corrosion giving the rigid conduits long life. Rigid conduits are for the job that requires physical protection that only thickest walls can provide,and rigid conduits are known for their thick walls and heaviest weights. Goodluck RMC is tough enough for use in outdoor applications, energy and manufacturing plants and corrosive environments. Goodluck rigid conduits have prestigious UL6 certification. (File No. E510369). We also make rigid conduits as per American national Standard for electrical rigid conduit (ANSI C80.1)