Use the NIBCO 4 in. x 4 in. x 2 in. PVC DWV 45 H x H x H Wye to join a branch line to a horizontal drain line in a PVC sanitary system. After priming, it is connected with solvent welds. Polyvinyl chloride (PVC) is the most frequently specified of all thermoplastic materials because of its light weight, durability, and cost-effectiveness. Color: White.