Plumb Pak K832-1 Flat Flush Valve Shank Washer, Rubber, 5-1/2 in W, 1/2"H x 5-1/2"W, Black;

Highlights: Fits American Standard, Kohler, Eljer and other flush valves with similar outlet size 4-1/2"OD x 3-3/8"ID x 3/8" thick Replacement flush valve: Catalog Id4395273 and 4395281 Blister pack Rubber