Advanced Drainage Systems is the world’s largest producer of corrugated HDPE pipe and related drainage products. ADS serves 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 complete line of fittings and other accessories including, Nyloplast drainage structures, and various geotextiles. Connect lengths of 4 in., single-wall, corrugated polyethylene drainage pipe with the Advanced Drainage Systems 4 in. Polyethylene Internal Coupler. The coupler's polyethylene material resist corrosion and abrasions. Color: Black.