Oatey 43538 ABS Cast Iron Flange Replacement, 4-Inch

worked great

Worked great

Build quality:well made

It works and gets the job done...but is plastic so we'll see for how long

I used this on an old cast iron pipe in a basement bathroom. Other reviewers have nicely detailed that this can be a difficult process because of the build up on the inside of the cast iron pipe (like rust). Using a holesaw and a drill, I was able to clean up the inside of the pipe so that this flange would fit nicely and have a smooth surface to seal against.TIP: Continue tightening the three bolts for this flange until they reach a clear stopping point. I was not sure when to stop and was afraid I would break it by overtightening. Thankfully, I kept tightening and it was obvious when I reached the "end" and the bolts would have required significant force to go any farther. It will feel snug pretty quick, but again, you'll hit a pretty obvious stopping point when it is completely sealed.

Easy install in a below-grade cast iron pipe. Installed over the old flange, and provided a new solid base for the toilet to mate with.

Most of the time Amazon let's me down. But not this time. The product information said for 4 inch pipe. But I took a risk and got lucky. This will fit in a 3 3/4 i.d. pipe. Will have to sand some rust off but still. Very happy.

This unit was purchased to replace a rotted cast iron flange while upgrading our bathroom floor. The only draw back I ran into was the cast iron pipe isn't smooth like PVC piping used in newer homes and the old pipe was slightly out of round. I used a cylinder hone after grinding off the high portions of the inside of the cast iron pipe. I also temporarily used a clamp to slightly correct the out of roundness. After doing those slight modifications, the unit went in the pipe snugly, secures to the new floor very well and secures the toilet securely. Most importantly, NO LEAKS!Using this unit definitely beats the old way of securing a flange to the cast iron piping. No oakum or lead needed!