Naco PVC 12" Coupling. Naco is the industries leader in manufacturing PVC pipe, fittings and valves. PVC Pipe is designed for both above and below ground DWV (Drain, Waste, Vent) Applications. Pvc is generally used for both commercial and residential plumbing construction. Naco covers your PVC needs in every industry from agriculture to drainage systems. This Naco PVC 12" Coupling is designed to connect and continue a line in a water system. This 12" Coupling is ideal for underground waste applications.