Schedule 80 PVC flanges have many different applications. Some of the applications include connecting two PVC lines, installing butterfly valves and capping off the end of a PVC line. Van Stone flanges come equipped with a loose ring so the holes of the flange ring can be lined up for easy installation. Schedule 80 PVC flanges have many different options to choose from to suit your application. They come in solid style, solid style threaded, blind flange style, and van stone style.