Personal experiences with the name Kiel: | Edit. My boyfriends name is Kiel pronounced Kyle because it is the name and spelling of a town in Germany that is a twin town to the one we live in Coventry.
A flapper is a rubber mechanism in your toilet tank that is the moving part of the flush valve, sealing water into the tank and allowing water to exit the tank when you flush. Flappers deteriorate over time as a result of in-tank cleaning products and chemicals used by utilities.
The flush toilet makes use of some hydrodynamics so it makes this a bit tricky, but I'll try to abstract away the fluids and simply represent them as forces. The flush toilet makes use of two separate levers and no other simple machines. The first lever is applied by the operator using the handle. In this case, the fulcrum is located at a midpoint between the ends of the lever. Connected to the handle is a moment arm which is connected to a chain.