5403 Adjustable Universal Toilet Flapper, 3" Size | Easily fix a running toilet with the Fluidmaster 5403 3 in water-saving adjustable toilet flapper. With easy arm adjustments, the 5403 flapper is designed to fit on all 3 in flush valve toilets. This flapper features a silicone seal that lasts up to 10 times longer than regular flappers. A solid frame design keeps the flapper from twisting and ensures the best seal every time. The 5403 Flapper is also adjustable so you can rest assured you're saving water with every flush.