Easily fix a running toilet with the Fluidmaster 5403, 3 inch Water-Saving Adjustable toilet flapper. With easy arm adjustments, the 5403 Flapper is designed to fit on all 3 inch flush valve toilets. This flapper is chlorine-resistant and 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 youre saving water with every flush.