Smooth interior with a Manning's value of 0.012 resulting in increased flow capacity;Inert HDPE material is resistant to the effects of chemicals, abrasion, hot soils, and effluent;Lightweight product for best-installed cost and maximizing delivery and installation efficiencies;Structurally designed corrugated exterior to support typical construction and long term loading;Readily available in convenient locations to service local projects;Joint options to meet your application performance requirements, including up to water-tight joints meeting ASTM D3212;Available in ST, WT and Plain End;Joint options include bell and spigot design, gasket, bell wrap or pressure-rated 10.8 psi coupler