Beakman explains who made the toilet and then shows a cross-section of a toilet to show the inside. Then he uses colored water to show how gravity pushes the waste out of the toilet into the drain. He then shows how the back tank of the toilet works with valves and gravity to push the water in the toilet bowl down into the drain.
The landlord changes the showerheads in all of the apartments, leaving Kramer, Jerry, and Newman with low pressure water. They turn to the black market to get the water pressure they need for a good shower.