Advanced Drainage Systems 8 In. Gravel-less Internal Coupling-

Internal coupling compatible with Gravel-less pipe for onsite septic systems. Gravel-less pipe is a spun-bonded nylon wrap that overlaps and is sonically welded to the pipe. Gravel-less pipe provides an excellent soil interface for passage of effluent into the soil. Gravel-less is a low-cost alternative to gravel filled leach field trenches. Gravel-less pipe provides a safe & effective septic tank effluent treatment.