Fluidmaster Bolt & Gasket Tank To Bowl Kit. It includes (3) 5/16 In. x 3 In. brass bolts, (3) red sponge rubber gasket, (6) brass washers, (6) rubber washers, (3) hex nuts, and (3) wing nuts. Gasket fits over both round and hex shaped flush valve nuts. It is suitable for closed coupled toilets, round and hex shaped flush valve nuts.