If you are installing a new toilet, mount the toilet tank to the base using a rubber seal, two bolts with wing nuts, four metal washers and four rubber washers. To mount the tank, place the rubber seal around the hole on the bottom outside of the tank. The seal is flat on the tank side. Place the tank on the toilet base.

Now put one metal washer and one rubber Washer on each bolt. The rubber washer must be against the ceramic of the toilet. Insert the bolts through the inside of the tank and down through the base. Install the rubber washers, metal washers and wing nuts from underneath. Tighten the wing nuts alternately, being careful not to over tighten them as you could break the toilet. Now carefully lower the toilet down onto the flange, guiding the bolts up through the holes in the base. As a finishing touch you can run a bead of caulking around the base of the toilet where it meets the floor.