PPR pipe is co-polypropylene water supply pipe modified by polypropylene pipe. The working pressure of it is lower than 0.6 MPA and working temperature is less than 70 degree. The connection way of PPR pipe is hot melting or electric smelting. There is specialized tool for copper pipe connection and the connection surface need to heating. The flow will be blocked if the heating time is too long or the bell and spigot is inserted excessively. Besides, the softening temperature of PPR pipe is 140 degree. It can be used as hot water pipe.