Sioux Chief 889 series full flush closet flanges shall be used where necessary in drainage systems. Flange shall allow 1-1/2 in offset in any direction and have a full-swivel, corrosion-proof stainless steel ring with sufficient holes for securing to floor and slots for inserting closet bolts. Flange shall have an offset inner diameter area properly sized to allow full 3 in spherical flow for complete drainage and clog resistance. Flange shall have a 3 in SCH 40/STD hub connection which conforms to ASTM D2665 (PVC). Closet flange shall be UPC listed. Always fasten closet flanges to the floor.