Use the NIBCO 1-1/2 in. PVC DWV Coupling to connect PVC piping lengths in drain, waste and vent piping systems. The PVC DWV coupling features a hub x hub connection and connects PVC DWV piping lengths with solvent weld connections. Polyvinyl chloride (PVC) is the most frequently specified of all thermoplastic materials because of its light weight, durability, and cost-effectiveness. Color: White PVC.