Oatey 43646 Flange Nuts, 1/2-Inch, White Builds up an existing closet flange when new flooring is installed Can be stacked to desired height The metal ring provides added strength and cracking resistance to the flange and can be rotated to allow precise alignment of bolts and screws Slides inside of 4-Inch cast iron or Sch. 40 DWV Plastic pipe 3-Inch stainless steel bolts are tightened from the finished floor Compression joint allows up to 3-Inch of adjustment to the riser No tearout or caulking required