Flexible triple layer tube for low plasticized pressure, stabilized in light and heat. Its multilayer structure consists of an inner and outer layer of dissipative (antistatic) Polyamide 12 PHL with surface electrical resistivity <10^6 Ohm according to ISO 8031:2009(E) and an intermediate layer of polyamide 12 PHL with excellent gas barrier properties. Suitable for use in ATEX environment, group 2, 2/3 G&D category, installation zones 1, 21, 2, 22. Electrically conductive outer and inner layers are able to dissipate the accumulation of electrostatic charges by avoiding the formation of sparks that can trigger explosions in potentially explosive environments. The middle layer gives barrier properties to reduce the particle permeation of the transported fluid.