As a direct replacement for Glacier Bay toilets, the 5401GB 3 in adjustable flapper from Fluidmaster helps stop a running toilet and restore factory performance. This flapper also works on other toilet brands. The 5401GB Flapper features a durable 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 5401GB Flapper is also adjustable so you can rest assured you're saving water with every flush.