NDS 4 in. Polyethylene Hub x SPT Adaptor is used to connect 4 in. corrugated drain pipe to sewer and drain (S and D) or drain, waste and vent (DWV) pipe. Polyethylene construction is durable, lightweight, economical and resistant to corrosion and chemicals. Adapts corrugated pipe to sewer and drain pipe or DWV pipe. Color: Black/Matte.