Red copper pipe, a type of non-ferrous metal tube. It is a pressed and drawn seamless pipe with light weight and good thermal conductivity. The connection strength of the copper tube is very strong, making it more practical. Because there are various types of pipes on the market, with copper pipes as the main interface accessories. Even if some pipes may not use copper accessories, there should still be a copper accessory at the interface with the faucet. However, if the copper pipe fittings are connected with other pipes, due to the different materials of pipes and fittings, the physical and mechanical properties of thermal expansion are very different, and the firmness of the connection will naturally be subject to additional challenges. Therefore, the connection between copper pipes and copper fittings will greatly enhance their firmness.