NIBCO 1-1/2 in. PVC DWV 90-Degree Hub x Hub Vent Elbow

The NIBCO 1-1/2 in. PVC DWV 90 Hub x Hub Vent Elbow. DWV is used for non pressurized sanitary system Drain, Waste, and Vent. There are 2 types of DWV plastic: ABS (black plastic) and PVC (white plastic). The sanitary drainage and vent piping are installed to remove waste water and water-borne wastes from the plumbing fixtures and appliances. DWV also provides a circulation of air within the drainage piping.