A perfect replacement for Kohler K-GP1059291 canister flush valve seal (red or yellow color). Compatible with K-4436 part..Made of high quality silicone material, compared with ordinary rubber toilet seal,our seal is better resistant to chlorine and other chemicals in the water supply and has a long service life. Fits perfectly with all Kohler toilets with a canister flush valve, can fixe leaks and prevents ghost flushes from happening. Outside Diameter: 3.375" Inside Diameter: 2.75"..Easy to install and uninstall, compared to other products，our product has a lip to improve ease of adding and removing new and old seals..Come with 4 pack flush valve seals. No need to spend a lot of money to get a repairman to fix it, our products can save you time and money. Installation steps： 1. Remove the valve stem by turning it from the bottom of the canister. 2. Remove the stem and old gasket, wipe off old rotting rubber on the surface. 3. Secure the inner ring of the seal around the tank lip. 4. Put it back and give it a few test rinses to make sure it's fully functioning and sealing properly..We offer worry-free warranty and friendly customer service within 12 months for your confident purchase. If you are not satisfied with any product, please don’t hesitate to contact us, we will serve you our best.