... , athetic field, square, mine agricltrue, and bridges. HDPE Hollow wall drainage pipeφ300 4KN/ to φ1400 8KN/This kind of pipes ... machine when burying without large equipment.Convenient connection: the pipe could be linked outside the ditch, then push it ... cost.Optimum wearing resistance: more wearing resistant than steel pipe and cement pipe, strong daily life water, waste residue delivery capacity ...