This kind pipe have many special characters,such as: no rustiness,no fouling,very smooth wall surface,efficient for water drainage,etc...compared with the tradittional steel pipe,it s ability on water drainage is improved by 50-60%,the pipe is very light,very convient for installation,and the price is very reasonable.which can reduce the cost of the labour,and can improve the effeciency by 50-60% than any other pipes.it's quality is very good and the outlook is very perfect,and it's widely used in the construction project and the country instruction field recently.