... 9001, 2000 2.CE certificate C.O.D Corrugated Optic Duct pipes summarized formerly each kind of fiber optics ... , bears the high pressure, the easy curving corrugated pipe is the female tube, after compound squeezes ... work quantities such as trench excavation, inner duct insertion (no need as it is readily built ... construction of telecommunication infrastructure. cod (corrugated optic duct) pipe