The NIBCO 3 in. PVC DWV plug is used in residential and commercial drain, waste and vent systems. The PVC DWV plug features a male NPT thread connection to fit inside a fitting to seal the end of a pipeline or a location where future additions may be made to the piping system. PVC fittings exhibit high corrosion and chemical resistance and will not rust, scale, pit or corrode. Color: White.