Advanced Drainage Systems is the world?ÇÖs 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. This 4 inch Polyethylene DWV Snap End Cap features durable and economical construction. That's ideal for terminating a run of single wall drainage pipe. That molded polyethylene construction is durable and economical.