Naco PVC 10"x6" Bell Reducer. 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 10"x6" Bell Reducer features a 4" drop in size designed to improve flow and the speed of waste removal.