The sacred sink of Cramalot is a large, golden sink seen in The Super Mario Bros. Super Show! episode "King Mario of Cramalot".
The sacred sink of Cramalot resides in the town square of Cramalot, where it has the Golden Plumber's Helper wedged in it. Legend has it that whoever removes the Golden Plumber's Helper from the sacred sink of Cramalot would gain untold power and become the new king of Cramalot.
Mario, needing the Golden Plumber's Helper to defeat King Koopa, manages to, after a lot of effort, remove the Golden Plumber's Helper from the sacred sink of Cramalot; after having the Golden Plumber's Helper removed from it, the sacred sink of Cramalot proceeds to spurt a large amount of water into the air, showering it down upon Mario.