Oatey 43507 Closet Flange, 3-Inch, White 3"" or 4"" all plastic flange solvent welds inside of 4"" or over 3"" Schedule 40 DWV pipe. 3"" inside fit flange fits inside 3"" Schedule 40 DWV pipe. Four mounting slots. Four countersunk holes for secure attachment to the floor. 3-Inch or 4-Inch all Plastic flange solvent welds inside of 4-Inch or over 3-Inch Schedule 40 DWV pipe 3-Inch inside fit flange fits inside 3-Inch Schedule 40 DWV pipe Four mounting slots Four countersunk holes for secure attachment to the floor 3-Inch or 4-Inch all Plastic flange solvent welds inside of 4-Inch or over 3-Inch Schedule 40 DWV pipe 3-Inch inside fit flange fits inside 3-Inch Schedule 40 DWV pipe Four mounting slots Four countersunk holes for secure attachment to the floor