The Oatey 4 Inch PVC Closet Flange is easy to use. Rubber compression gasket enables the flange to be used on many types of cast-iron piping. 3 stainless-steel bolts are tightened to compress the rubber gasket to secure the flange to the existing piping. Compression joint provides up to 3 in of adjustment to the riser. Use as a replacement flange for broken flanges.