Now remove the top of the tank to the toilet. It may be heavy because it is made from porcelain. Be careful not to drop it. Get rid of the extra water in tank by flushing the toilet. The less water in the tank the easier it will be to fix the part. If you wish, you can put on rubber gloves but they are not necessary. Remove the old flapper; it may be a bit brittle so be careful. Open the new flapper; they will come with directions on how to install. If they don’t then you can follow these steps. Place the serrated strap into the hole located at the front of the new flapper. Then thread into the hole located at the front of the flapper.
Take the strap all the way until it locks into place where it is secure. Attach the chain to the new flapper; make sure the chain is securely on the flapper. Turn back on the water and flush the toilet, it is the next way to check for leaks. Place the tank lid back on and you are ready to go.