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Hi, I have a problem with my toilet flange installation. The problem is that I have a normal 3 inches abs pipe that it is cut flush to the Polish concrete floor. So I had to buy a toilet flange the fits inside the 3" inside diameter. But this toilet flange has a inside diameter of 2.5". My toilet hole (also flanged see picture) has a 3" outside diameter that does fit inside the abs flange. So it leaves a gap between the toilet and the abs flange. It would result in my toilet not laying on the concrete floor but floating at 0.25". Should I use a grinder to cut a little bit the ceramic flange on the toilet. Or only use a classic copper flange and only count on the wax ring to seal this?

I hope I'm not to confusing with my problem explanation.

Thanks for any tips.

Of course I can try to break the concrete around my abs pipe
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I know this guy got banned but one time I took a skilsaw with a concrete blade and shaved an 1/8th of the horn of the toilet to get it to sit down when I used one of those cheater flanges that fit in the 3” and this happened to me.
 

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I know this guy got banned but one time I took a skilsaw with a concrete blade and shaved an 1/8th of the horn of the toilet to get it to sit down when I used one of those cheater flanges that fit in the 3” and this happened to me.
I have a diamond blade for my grinder. Maybe once a year I take it to a fixture for some oddball reason.
 
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