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.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.