Black Swan's Sponge Rubber Gasket - Tank-to-Bowl is a high quality sponge rubber gasket. Used to connect and seal tank to closet bowl. For new installations, remodeling or when bowls need to be reset for repairs. Size is 3-1/4” O.D. x 2-1/8” I.D. x 9/16” high. Fits most closed-coupled toilets.