Copper Capillary Tube is a generally used throttling device that is used in air conditioning and refrigeration systems. It is made from copper in a small diameter. This tube has a long length and is coiled to consume less space during the installation. In addition, the internal diameter can vary from 0.5 to 2.28 MM. When the refrigeration stops, the pressure in our tube becomes the same. Therefore, it implies that when the refrigerator system is stopped, the pressure on all sides is equal.