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What is the curve in a pipe or drain that traps water and prevents the escape of noxious fumes or vapours?
Carolinechristinep
That would be the P-trap. The dip in the P always keeps a plug of liquid preventing gas from coming into the living space.
A P trap is one of many types of "traps" there are grease traps, drum traps , bell traps , running traps , 1/2 S traps some are legal to use and some are not depending on location and useage
A trap alone cannot be considered prtotection unless it is properly vented OTHER then storm traps
It is also called a UBEND
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