Sioux Chief 883 or 884 series TKO™ closet flanges shall be installed where necessary in drainage systems. Closet flange shall be fastened to floor and provide tabs or slots for fastening closet bolts to flange ring. Flange shall have a 3 in SCH 40/STD hub connection which conforms to ASTM D2665 (PVC) or D2661 (ABS) and also install inside most 4 in pipe. Knockout cap must come out in one piece and shall be sized larger than drain opening, preventing it from falling down drain line. Closet flange shall hold a standard head test and be UPC listed.