C5851A43 4 In. x 3 In. ABS Flange x Hub Closet Flange Adjustable. DWV is used for non pressurized sanitary system Drain, Waste, and Vent. There are two types of DWV plastic: ABS black plastic and PVC white plastic. The sanitary drainage and vent piping systems 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. ABS black and PVC white plastic pipe and fittings have identical uses. The only reason for selecting one material over another is either the cost of the material or local plumbing code restrictions.Used for mounting water closetSolvent Welded ConnectionsNever use primer with ABSMade in USA