Oatey 43645 Closet Flange Spacer Kit, 1/2-Inch For use overlaying, replacing or tiling bathroom floors Provides hassle-free use Includes closet bolts and shims 3-Inch Spigot Closet Flange fits inside the hub end of 3-Inch Schedule 40 DWV fitting 4-Inch Spigot Closet Flange fits inside the hub end of 4-Inch Schedule 40 DWV fitting Solvent weld into fitting-short throat length is perfect for use in tight spaces and where the fitting is close to the sub-floor Four mounting slots for proper fit and alignment of closet bolts to the toilet