I read through all the questions and responses to various toilet flange problems and I think I found the solution from one of speedball1's responses, but let me summarize to make sure. I have a toilet in the basement which is over concrete. I pulled up the toilet and there is no flange. The bolts holding down the toilet were put into a drilled hole then patching concrete was used to hold them (my guess). The toilet drain is 3 1/2 inches (yeah that is the real inside measurement. My problem is the 3 1/2 drain since there are no PVC with rubber gaskets made to fit inside.

speedball1 mentioned that a flange is not necessary and is prmarily used to hold down the toilet which makes sense. He also mentioned to use a wax seal with a funnel (I never knew they made those things with a funnel, but followed his link and saw the miracle device).

Since my drain is 3 1/3 inches, I assume I will need a 4 inch wax seal?

The other option might be to have someone come in and weld a cast iron flange to the opening. Any ballpark estimate of how much this would cost?

I read through all the questions and responses to various toilet flange problems and I think I found the solution from one of speedball1's responses, but let me summarize to make sure. I have a toilet in the basement which is over concrete. I pulled up the toilet and there is no flange. The bolts holding down the toilet were put into a drilled hole then patching concrete was used to hold them (my guess). The toilet drain is 3 1/2 inches (yeah that is the real inside measurement. My problem is the 3 1/2 drain since there are no PVC with rubber gaskets made to fit inside.

speedball1 mentioned that a flange is not necessary and is prmarily used to hold down the toilet which makes sense. He also mentioned to use a wax seal with a funnel (I never knew they made those things with a funnel, but followed his link and saw the miracle device).

Since my drain is 3 1/3 inches, I assume I will need a 4 inch wax seal?
The other option might be to have someone come in and weld a cast iron flange to the opening. Any ballpark estimate of how much this would cost?

I would not even worry about a flange. If the bolts are still there I would uae them. If not then I would drill 1/4" plastic inserts and use threaded closet bolts. I would then use a 4" wax seal with a attached funnel. Good luck, Tom