3" hub/inside 4" ABS, flush to floor, knockout closet flange will not break apart and cannot fall down drain pipe

Strong, corrosion-resistant 1-piece stainless steel ring eliminates cracked flanges

Easier installation, no need to hold knockout while hammering

Holds 5 floors (22 P

S

I

) for head test

The inside diameter of pipe can vary significantly

These flanges are designed to fit inside most, but may not fit all types of pipe