This TKO 3 inch hub/inside 4 inch, flush to floor PVC total knockout closet flange offers easier installation, and there's no need to hold knockout while hammering.
3 inch hub or 4 inch inside connection
3 inch hub or 4 inch inside connection
Knockout will not break apart / cannot fall down drain pipe
Holds five floors (22 PSI) for head test
Easier installation, no need to hold knockout while hammering