corrugated double-wall pipes

The corrugated double-wall pipes of this company are in full compliance with national and international standards. These pipes are generally produced with ring stiffness 31.5 kN and are sometimes offered in more resistances at the request of esteemed buyers.
The outer wall of these pipes is black due to the addition of soot to  polimer, which aims to be resistant to sunlight and increase the physical strength of the pipe.
The inner color of the pipe can be different and what is common in Iran is yellow.

GHADRETTESAL pipes include the following sizes (inner diameter): 110mm-125mm-160-200-250-300-315-400-500-600-700-800-900-1000

The pipes are produced in lengths of six meters. One end of the pipe has a coupler where the other is inserted. One end of the tube is male and the other end is female, which are inserted into each other as push-fit after installing the washer.