Oatey 42255 Closet Flange, 4-Inch, Cast Iron This is a great product that serves as an alternative to an old style "oakum and lead" joint in replacing a broken cast iron flange. It can be used by DIY'ers, but you must be prepared to do any clearing and chiseling work needed to get the flange down so the top of the flange is no more than 1/2" above,and and no lower than even with, the finished floor level, the job that you would otherwise be paying the plumber to do. It can also be used to raise the level of an older cast iron flange by replacing the flange, but simpler and easier alternatives are available for that.For novices seeking or needing more information, you may wish to read some or all of the following:1. This flange is designed to replace an existing cast iron flange that is broken, or, possibly, to replace an existing cast iron flange that is below the level of the floor. It is not used to elevate or repair an existing flange. It uses a rubber gasket and a bolt down brass plate instead of the older oakum and poured lead method of sealing the joint between the flange and the drain pipe.