Product Description Toilet flapper replacement compatible with Gerber 99-788 Replace old, leaky, and inefficient toilet flappers to save on expensive water waste with this large toilet flapper The long-lasting blue rubber is fit for city water treatment, hard water, and well water. No tools are required for installation. Includes stainless steel chain with clip hook. Meets US and Canada industry standards for plumbing code.? 2 PACK 3 Inch Toilet Flapper Replacement Compatible with Gerber ? ? Get Rid of Toilet Issues Fast No tools are needed with easy installation design. No need for a handyman. Get rid of those faulty and leaking toilets once and for all, keeping your toilet running at optimal performance. how to install?? ? 1. Turn off the water valve to the toilet. 2. Hold the handle down and drain out the water from the tank. 3. Remove the old leaky flapper. 4. Replace the new flapper in the same place, and install the chain well. 5. Done! ? Water-Saving, High Performance Easy to Install Made of the long-lasting blue rubber Meets US industry standards for plumbing code. High-Quality Rubber A good quality rubber toilet flapper can be more durable so that your toilet does not leak water and produce noise. Easy to Install The simple installation method does not require tools, and can quickly complete the replacement of the old toilet flapper. Suitable for more types of toilets Hibbent 3 inch toilet flapper cover can be a good replacement for need 3 inch stopper flapper various types of toilets.