3 Inch Toilet Flapper Replacement Compatible With Gerber 99-788, Easy To, 4Pcs 3 Inch Toilet Flapper?Compatible with Gerber 99-788. Please make sure the size of the tank flush valve hole before purchasing. Long-lasting Rubber?Toilet tank flapper is made of soft, durable, and long-lasting rubber with stainless steel chain and hooks. The blue rubber fit for city water treatment, hard water, and well water. Easy to Install?Close the water valve leading to the toilet, drain the water from the tank, remove the old leaking flapper, install our new 3 inch flapper, and install the chain. Notication: If your old baffle is hard to take out, you can cut it, don't pull it open forcibly to avoid damaging the tap. Fix Hissing Leaking Toilets?With this 3 in toilet flapper replacement kit, quickly fix running and leaking toilets and eliminate costly water waste. ?? Package Includes?4* 3-inch Toilet Flapper. When you open the package will have an odor, placed after a period of time, the smell will be eliminated.