NIBCO | sku: 92758 Nibco 4 in. X 2 in. Pvc Dwv Spigot X Hub Flush Bushing The NIBCO 4 in. x 2 in. PVC DWV Spigot x Hub Flush Bushing can be inserted into a PVC sitting hub to reduce the hub to a smaller pipe size. The bushing is designed for use with drain, waste and vent piping systems. PVC fittings exhibit high corrosion and... Log in for pricing