Double walled cable protection tube supplied in coils. The pipe consists of a corrugated exterior and a partially smooth interior. The outside of the tube is made of HDPE and the inside is made of a polyethylene quality with special bending properties. The inner tube is colored green or black. The pipes are intended for cable protection and are placed with as few joints as possible. Joints are made using sandproof joints or with watertight joints for a tighter fit. Available with a preinstalled pull rope.