Perfect quanlity and competitive price. The professional manufacturer of siphon,drainage,ground source. Black HDPE pipe is good for anti-UV ... anti-aging, anti-corrosion.The useful life of HDPE pipe is more than 50 years.wall is smooth,not ... reliable.• Good flexibility,small tube can be winding,pipe can be meandering along the ditch.resist the ... drainage,the same layer drainage system. HDPE pipe clamp