Product Description Oatey 4 in. Replacement Closet Flange installs easily without tearing up your flooring or caulking piping. It fits inside of 4 in. cast iron or Schedule 40 DWV piping (sold separately). Its rubber compression gasket allows the flange to be used on many types of cast iron piping. Oatey products have earned the trust of plumbing professionals for over 100 years. From the Manufacturer Oatey products can be found in residential and commercial applications and have achieved excellent brand name recognition with consumers. All products are backed with the highest quality technical and customer support programs in the industry