♦  The silicon core layer of the inner wall is solid, permanent lubricant;

♦ The silicon core layer of the inner wall is synchronous extrusion into high density polyethylene pipe wall, and uniformly distributed throughout the inner wall of the pipeline, it will not peel, detachment, and the same life silicon tube;

♦  The silicon core layer of the inner wall with high density polyethylene with physical and mechanical properties of the same;

♦ The friction characteristics of the inner wall of the silicon core layer remains unchanged, the cable in the pipeline can be repeatedly extraction;