Четыре отверстия пластиковые трубки связи

Four holes by four small fang plastic gratings composed of quadrate aperture, fong perforated pipe diameter hole two 42mm and 50. Grille tube length, allow deviation 6000mm nominal 30mm - 0. Four holes through a grating tube corridors, research, consultation, eventually developed a new kind of communication engineering used in the pipeline. Because plastic pipe material price is gradually low, at four holes grille tube of plastic pipe of comprehensive cost has lower pipe and tube son of cement comprehensive cost of complicated topography. Suggestions in special pipeline construction, cable should be preferred, say so, plastic pipe is four holes of modern communication engineering grating selection of materials.