Tunnel-type drainage pipes are manufactured in blue, in diameters of 100mm, 150mm, and 200mm, in lengths of 6m, and with self-plugging. Their lightweight and easy installation saves on material and labor. Their flat, imperforate base allows for easy drainage of water within the pipe without allowing it to leak to the bottom. They can also be manufactured imperforately for use as collectors at road crossings. In the drainage works of industrial buildings, housing estates, gymnasiums, schools, hospitals, hotels, and similar structures;
It is preferred in the drainage works of airports, dams and irrigation lands; and in the drainage works of highways, roads and railways.