HDPE Corrugated Pipe. Dual wall - corrugated exterior with reinforced double arch corrugations and smooth interior orange or black liner. Dual layer co-extruded integrated bell. 100% watertight bell-spigot joint with elastomeric seal included. Manning's n value for use in design shall be 0.010.

TDR Ultra - Orange Liner

TDR Ultra WT - Black Liner