Removing an Old Brass Toilet Valve Seat Without Bolts

Rotate the water supply handle behind the toilet and against the wall to its extreme clockwise position to shut off the water supply.

Flush the toilet to drain the tank.

Lift the cover off the toilet tank.

Remove the small quantity of water left in the tank with a towel.

Turn the nut at the tip of the water supply line, where the line attaches to the bottom of the tank, in a counterclockwise direction with a wrench until the line disconnects from the tank.

Pull the rubber overflow line out of the vertical tube attached to the top of the valve seat.

Remove the screw or clip from the linkage that secures the tank ball to the back of the flush handle. The tank ball is the rubber ball that fits within the valve seat. Remove a screw with a screwdriver. Pull a clip off the linkage with pliers.

Remove the nuts that secure the tank to the bowl with a wrench. Access the nuts from underneath the tank.

Lift the tank off the bowl and position the tank on its side to access the large nut on the bottom of the tank. This nut secures the valve seat to the tank.

Turn the nut in a counterclockwise direction with a wrench until the nut detaches from the tank. Guide the valve seat out of the tank.