With the NIBCO 4 in. PVC DWV 90 Spigot x Hub Street Elbow, you can complete the installation of your DWV system. PVC construction helps air circulate in drainage piping, but be sure to apply a primer to the PVC before solvent cementing. PVC fittings exhibit high corrosion and chemical resistance and will not rust, scale, pit or corrode. Color: White.