Step 5 · Replace Gasket and Bolts
With the tank resting on its back, you can see the large, old tank-to-bowl gasket (also called a spud washer) around the flush valve assembly. Pull this gasket off. If there are any remaining old bolt heads inside the tank, remove them. Thoroughly clean the area on the bottom of the tank around the flush valve opening, as well as the corresponding surface on top of the toilet bowl, using a putty knife or scraper to remove any old, dried gasket material. Insert the new bolts from your kit through the holes from inside the tank, making sure the new rubber washers are on the inside to create a seal. Finally, press the new, large tank-to-bowl gasket onto the flush valve threads on the outside of the tank. Ensure the tapered side of the gasket faces down, away from the tank, as this side will fit into the opening on the bowl.