Oatey 43587 PVC Spigot Closet Flange, 4-Inch, White For use in hub-end of fitting Fits on inside of fitting Eight countersunk holes and two closet bolt slots for secure attachment to the floor 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 8 Screw holes for more secure floor mounting