Do you know why the pipe below the wash basin (sink) is U-shaped?
Also,if you’ve ever dropped something valuable down the drain, like a ring or a house key, you know that curvy pipes can prevent lost objects from being lost forever. Many a ring has been fished out of the curve in a drainpipe, which often stops objects that fall down the drain from washing out the sewer. Although curvy pipes come in handy for trapping valuables, that’s not the main reason for the curves.
The U-shaped pipe can be seen in the above picture.
It has a very special purpose. Since there is a little bend in the pipe, some amount of water always stays in the bend (as you can see in the picture).When you run water down the drain, gravity forces the water through the curve and out the sewer pipe. When you turn off the faucet, some water gets trapped in the U-shaped part of the pipe, forming a water seal. The water completely fills the bottom curve this water acts as a barrier between the drain under the house and the sink above.
This will prevent any foul smell (sewer gas) from rising up into your home/office. This special pipe with a little bend is known as a P-trap.
Important: If you smell something gross in your house, a defective P-trap in your kitchen/washroom could be the culprit.
THANX
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