In the construction of copper fittings, the brazing connection is most widely used method. Brazing is to heat all of copper fittings, copper pipes and copper phosphorus brazing whose melting point is lower than copper or tin copper; in the case of copper fittings are not melt, heat to the brazing filler has been melt; then fill the melt brazing filler into the gap of socket; cooling crystallization make the copper fittings form the brazing seam, becoming the a solid connection.

The current national standard of copper fittings is GB/T18033-2000. The copper fittings used for water supply is usually T2 or TP2 alloy, copper content should be 99.9%. The disadvantage of copper fittings is that the thermal conductivity is fast. To avoid this drawback, the best method is to cover the insulation layer out of copper fittings, reducing heat loss. Although on the market today, the copper fittings covered by plastic, but the role of its insulation is limited, you'd better put rubber shell on the external surface of copper fittings and then to improve the hot water pipe insulation.