Porcelator
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A porcelator is a little hole in the sink that drains out the water before they overflow.
The size of the porcelator is relative to the size of the sink. The porcelator is placed higher than three quarters of the height of the sink. Once the water reaches a certain level, they spill out through the procelator into the pipes. The porcelator may prevent overflows that cause wet slippery floors.
After the sink is molded, three holes are drilled through it, a big one on the bottom, that's the main drain hole, one for the faucet, and the porcelator. After the porcelator is drilled out it is usually covered by metal (unless it is a metal sink). The porcelator must be in certain proportion with the faucet, in order for it to work. if the faucet is too large, the flow might overpower the porcelator and an overflow will occure.
This is called an "overflow" in England.