Sioux Chief 886 series TKO closet flanges shall be used where necessary in drainage systems. Flange shall have a full-swivel, corrosion-proof stainless steel ring, with suffi cient holes for securing to floor and slots for inserting closet bolts. Flange shall have a knockout, sized larger than the opening, which comes out in one piece preventing it from falling down the drain line. Flange shall have a 3 in Sch. 40 spigot connection which conforms to ASTM D2665 (PVC) or D2661 (ABS). Flange shall hold a standard head test and be UPC listed. Always fasten closet flanges to the floor.