From the inner wall of the aluminum tube, since the refrigerant does not contain water, the inner wall of the copper aluminum connecting tube will not be corroded. The lower the heat transfer efficiency of the connecting pipeline between the indoor unit and the outdoor unit of the air conditioner, the more energy will be saved, or the better the insulation effect, the more power will be saved. Excellent bending performance, easy to install and move.

The corrosion resistance is not high. Anodic oxidation and painting methods are often used or aluminum coating is added on the surface to improve the corrosion resistance. It can also be used as die material.