- Premium Quality: Made from durable, soft rubber, this toilet flapper provides a reliable seal to prevent leaks, helping you conserve water and reduce costs over time. - Perfect Compatibility: Designed to fit 3-inch flush valves, this flapper replacement meets plumbing standards for both U.S. and Canadian toilets. Its perfect sizing ensures that the flapper remains open long enough for an effective flush. - Efficient Replacement: This flapper is specifically engineered for the Gerber toilet model 99-788. It effectively replaces old or leaking flappers, restoring optimal toilet function and minimizing water waste. - Simple Installation: Replacing your toilet flapper is easy and requires no tools. Just turn off the water, drain the tank, remove the old flapper, and install the new one using the provided chain. If the old flapper is stuck, carefully cut it to avoid damaging the valve. - Cost-Effective Package: The set includes four Gerber flapper replacements, giving you extras for future needs. By handling the installation yourself, you can save on costly plumbing services and prevent future leaks. - Important Measurements: Ensure your toilet tank has a 3-inch opening. The Gerber flapper measures 4.9" x 3.66" and is specifically designed for 3-inch flush valves. Use Cases: 1. Replace worn flappers in your home to enhance toilet efficiency and reduce water bills. 2. Keep a spare flapper on hand for quick repairs in rental properties or guest bathrooms. 3. Perform a DIY upgrade to maintain your Gerber toilet system without professional assistance.