The color code of Rifeng water pipe is used to represent the medium transported in the pipeline. According to the conventional color coding, the water supply pipeline is green, the cold water pipeline is blue, the hot water pipeline is red and the gas pipeline is yellow. Green water pipes are used to supply drinking water or other non-heating water. Blue water pipes are used to supply cold water, such as cold water pipes in tap water systems. Red water is usually used to supply hot water, such as hot water pipes in hot water systems. Yellow water is usually used to transport gas, such as natural gas pipelines in homes.