Advanced Drainage Systems is the world largest producer of corrugated HDPE pipe and related drainage products. serve the storm and waste water industry through a global network of 56 domestic and international manufacturing plants and 27 distribution centers. In addition to its flagship N-12 pipe, the company offers a line of fittings and other accessories including, Nyloplast drainage structures, DrainTech basins, channels and grates, and various geotextiles. Made from durable high density polyethylene flared end sections helps diffuse a outflow from a culvert, making them an ideal addition to your system. Color: Black.