LN-5(Ncr) PVC Covered Type flexible metallic conduit is coated one protective layer of soft polyethylene (PVC) on the surface of LN-4B metallic conduit by special method. Besides owning characteristics of the LN-4B product, it has excellent water resistance, corrosion resistance and chemical resistance. It is applied to be all kinds of brightly or darkly embedded and straight buried piping. Moreover, it also can replace the ground and slot wiring, etc.