Extra Large Flush Valve Gasket (4.9 inch x 3.6 inch) (125mm x 91mm) Replacement for Kohler 1097686 Flat Seal 125mm x 91mm 4.9 inch Outer Diameter x 3.6 inch Inner Diameter .45 inch or 11mm Tall Replacement for Kohler 3.5 inch Flat Seal #1097868 Compatible with all Kohler Single Flush Class 5 and Class 6 Canister Toilets Rubber gasket for a tight seal, prevents leaks from your Flush Valve Flexible material for easy installation Fits Flush Valve. Flush Valve not included