• Ten years of proven performance
• Knockout will not break apart and cannot fall down drain pipe
• Strong, corrosion-resistant stainless steel ring eliminates cracked flanges
• Easier installation, no need to hold knockout while hammering
• Holds five floors (22 PSI) 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.