The Large 3 In. Tank to Bowl Gasket and Hardware Kit is designed to fit specific toilet models that were made after 2000. Fits 3 In. and 4 In. flush valve opening. The universal sponge rubber design measures: 3 In. inner diameter, 4-1/4 In. outer diameter and 1-1/8 In. thick. The included hardware is stainless steel to ensure a long, corrosion-resistant life. The tank to bowl gasket fits most 3 In. two-piece toilets including, but not limited to: American Standard Cadet 3 (4019, 4021), Champion (4260, 4272, 4281), Champion 4 (4077, 4266, 4272, 4281), AquaSource (AT1201, AT 1203), Crane Sure Flush (31242), Eljer Diplomat (4019, 4021), Stratus (4007), Titan (141-0777), Titan 4 (4272), Ferguson Pro Flo HET (PF9400), Gerber Avalanche (28-890, HE-28-890), Jacuzzi Era (BK37), Espree (EZ36), Maxima (EZ37), Perfecta (EZ33, GU04959), Prestige (GV80), Mansfield Barrett (106), Summit (386), Maverick (112), Waverly (3195), Pegasus Westminster (164-146), TOTO Drake (743S), Eco Drake (743E), Tuscany Sereno (11-105). NOTE: tank to bowl gasket is not compatible with Kohler toilets. Easy to install, includes sponge gasket and set of hardware.