The copper tube has good heat transfer performance and high low temperature compressive strength. It is often used in the manufacture of heat exchange equipment (such as condenser, etc.). It is also used to install low temperature pipeline in oxygen making equipment. Copper tube with small diameter is commonly used to transport liquid with working pressure (such as lubrication system, oil pressure system, etc.) and pressure tube as instrument panel. The red copper bar has the characteristics of firmness and corrosion resistance. Copper tube mainly has the following advantages: copper tube material is hard, not easy to etch, and high temperature, high pressure resistance, can be used in a variety of environments. Compared with copper pipe, the defects of many other pipe fittings are self-evident. For example, the hot-dip galvanized steel pipe, which is widely used in housing in the past, is very easy to rust, and the drinking water will turn purple and the water flow will shrink after a short time.