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You can easily find the main sanitary sewer trap by locating the fresh air inlet which is located no more then 4 feet behind the building house trap.

It will be 1/2 the size of the main sewer but in no case less then 3" and 12" above grade min.

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15y ago

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What is the purpose of a basement sewer trap and how does it function to prevent sewer gases from entering a building?

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