Advanced drainage Systems is the worlds 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. Made from durable high density polyethylene, this 4 inch 90 degree elbow fitting is made to join 4 inch single wall corrugated polyethylene drainage pipe.