Protective tube for TELKOM optical telecommunication cables (RHDPE) 50/4.6 - 100m. Casing pipes for TELKOM optical telecommunication cables (RHDPE) are used for the construction of local and long-distance telecommunication secondary ducts and cable pipelines. TELKOM pipes are pipes with a smooth outer surface and a grooved inner surface with a sliding layer. As a standard, they are made in black with multicolored stripes on the outer surface.