The subject innovation relates to a waste water trap, and in particular to allow effective odor backflow barrier to prevent the backflow of odors relates to a waste water receiving.; The configuration of the present design is characterized in that in the sewage receiver having a drain hole for discharging the waste water flowing into the lower side to the sewage pipe,; It has a separate body with a top portion is open to the inside of the waste water trap, and has one side of the body is provided with a drain pipe connected to an inlet for being connected to the home through a sidewall of the sewage receiver, the other side while facing the interior of the sewage receiver but communication installation the outlet for discharging the introduced sewage into the sewage receiver, and so at a higher position than the upper body connection part of the drain bottom of the inner peripheral surface of the outlet end, the waste water discharged is always retained at a constant level in the inlet and drain hole is one such that the distribution of the malodor blocking by blocking a communication space.; The subject innovation with the above structure, since in the sewage receiver which accepts the waste water in the home discharged to the sewer odor backflow blocking device for keeping the waste water work jeongsuwi block the reverse flow space of the odor is installed the occurrence of odor from the waste water receiving It has the advantage that the odor blocking effect resulting from the underlying block high.; In addition, there is an advantage in that even though the construction errors of the water pipe to the sewage and receiving occur easily overcome the connection error since the elevating height of the odor backflow blocking device to be adjusted in the sewage receiver.
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