2" Tank To Bowl Gasket & Hardware Kit, Universal To Fit Most 2" Two-Piece Toilet Tanks, Universal Sponge Rubber Design Measures: 2-1/8" ID x 3-1/2" OD x 1-1/4" Thick, Hardware Is Stainless Steel To Ensure A Long, Corrosion Resistant Life. Easy To Install, Includes: (1) Sponge Gasket & (1) Set Of Hardware.