is a corrugated "helix" flexible duct used for underground energy and telecom cabling protection, designed to resist the mechanical tensile strenght and underground soil chemicals. Launched in japan in 1981 and in brazil in 1984. Obtained quick recognition from the energy and telecom carriers in brazil, mainly due to its flexibility and resistance, eliminating the need of concrete enveloping in the duct banks.
it is supplied in black color, in rolls.
available in ø 1 1/4" to 8" diameters.