The 2" Tank to Bowl Gasket and Hardware Kit is universal to fit most 2" two-piece toilet tanks. The universal sponge rubber design measures: 2-1/8" inner diameter, 3-1/2" outer diameter and 1-1/4" thick. The included hardware is stainless steel to ensure a long, corrosion-resistant life. Easy to install, the 463 includes: (1) Sponge Gasket and (1) Set of Hardware.