The AD brand hdpe double-wall corrugated pipe is made of high-density polyethylene as the main raw material. The inner wall is smooth, and the outer wall is a unique annular corrugated pipe with a hollow shape between the inner and outer walls. The outer wall of the AD brand corrugated pipe is black, the inner wall is blue, and there is a green rib line on the black outer wall, which is particularly obvious, so as long as the outer wall of the corrugated pipe has a green rib line, it can be determined that it is the AD brand double-wall corrugated pipe.

If these are not sure, you can check the steel stamp on the outer wall of the AD corrugated pipe. The words printed with the AD logo and hdpe double-wall corrugated pipe, GB/T 19472.1-2019 are real AD double-wall corrugated pipe.

Attached, GB/T 19472.1-2019 HDPE double-wall corrugated pipe national standard