The NIBCO PVC DWV double wye is used in residential and commercial drain, waste and vent systems. The PVC DWV 45° double wye features all hub connections and allows for a connection to be made in continuous pipeline and branch out to different directions. Polyvinyl chloride (PVC) is the most frequently specified of all thermoplastic materials because of its light weight, durability, and cost-effectiveness. Color: White.