The NIBCO 4 in. x 2 in. ABS DWV flush bushing is used in residential and commercial drain, waste and vent systems. The ABS DWV flush bushing features a spigot x hub connection and provides a means for reducing the size of the line. ABS DWV is joined by solvent cementing or threading and can easily be connected to steel, copper, or cast iron through the use of transition fittings. Color: Black.