Step 4 · Replace Gasket and Hardware
With the tank removed, you will see the large, spongy tank-to-bowl gasket. Pull off the old gasket from the threaded outlet of the flush valve. Remove the old tank bolts and their rubber washers from inside the tank. Use a rag to thoroughly clean the area around the flush valve outlet on the bottom of the tank and the water inlet hole on the top of the bowl. Any grime or sediment can prevent a good seal. Install the new tank-to-bowl gasket by stretching it over the flush valve outlet. Install the new bolts by pushing them through the holes from inside the tank, ensuring the new rubber washers are on the inside to create a seal.