Oatey 43512 Flange Nuts, 3 4-Inch, Black Versatile and effective Convenient and easy to use Durable and long lasting The metal ring provides added strength and cracking resistance to the flange and can be rotated to allow precise alignment of bolts and screws Solvent welds inside of 4-Inch or over 3-Inch Schedule 40 DWV pipe 2-Inch offset allows a margin of error for drain pipe/flange alignment