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my5kids

08:48AM | 05/07/02
Member Since: 05/06/02
2 lifetime posts
Bvplumbing
Why is the main drain pipe under the sink "U" shaped?

Jim D

12:09AM | 05/08/02
Member Since: 01/06/01
345 lifetime posts
Hi - basically, the U acts as a trap to hold some water. The water prevents sewer gasses from coming up into the house though the pipes. I'm not a plumber and I may not have stated this totally right, but it's my understanding. Have a great day!

Jim D/Heathsville, VA

rpxlpx

04:58AM | 05/08/02
Member Since: 03/13/00
1678 lifetime posts
Jim D is right. Not only sewer gas, but anything else that's in the sewer, like insects could come through straight pipes. The "U" holds enough water to act as a seal of sorts.
If you were to not use the sink for a long time, the water in the "U" could evaporate, so it doesn't hurt to run a little water in each sink occasionally when they're not in use.
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