PURPOSE: To converge waste water flowing into a pit so as to fall smoothly into a vertical drain pipe. ;CONSTITUTION: The lower part of a pit body 11 diameter-contracted in cone shape is provided with a lower end connection 13 to which a vertical drain pipe 3 is connected. The upper part of the opened pit body 11 is provided with an upper end connection 14 to which a cleanout pipe 4 is connected. The side wall of the pit body 11 is provided with an inflow port 12 to which a sewer pipe 2 is connected from the horizontal direction, and the inner wall surface of the pit body 11 curved in cone shape from the inflow port 12 to the lower end connection 13 is recessed into gutter shape to provide a drain ditch 15. Drainage flowing into a pit can be thereby discharged smoothly.;COPYRIGHT: (C)1996,JPO
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