My question is: is there a special/specific type of wax ring that should be used with an offset flange. I have installed many toilets over the years and this is the first time I have ever seen an offset flange. When I took the old toilet off the wax ring wax not properly lined up with the flange opening. I want to make sure that nothing can leak as I have brand new floors that I don't want to. Apr 26, · An off-set toilet flange is different from a traditional toilet flange in that the top opening, which the wax ring and toilet sits above, is offset from the insertion point by varying amounts. Sometimes this amount can be up to an inch and a half. Installing an offset flange in place of a traditional straight flange is not compliant with building code; it is considered a modification that is. Or, you can use 2 no cone wax rings, and cut them so you create a custom oval wax ring that fits all the way around. I use this solution on old 5" cast flanges where a single 4" wax ring just gets pushed down the drain when the toilet is installed.