The proposed utility model relates to devices for the treatment of domestic wastewater and can be used in the treatment of domestic wastewater for separately located objects of sparsely populated areas and individual residential buildings. The technical result of the proposed utility model is to expand the functionality by improving the quality of cleaning the septic tank by machine. 1 contains a working tank 2, a neck 3 and a cover 4 of a neck 3, as well as a vertically mounted pipe 5, rigidly connected with the body of the working tank 2. The lower end of the pipe 5 is in contact with the bottom of the working tank 2. The upper end of the pipe 5 is located outside the working tank and serves to connect the hose of the scavenger to the inner cavity of the septic tank. The lower end of the pipe 5 is perforated along the lateral surface, such as, for example, in the form of either triangles, or rectangles, or trapezoids, etc. (these types of perforation are not shown in the drawing), either in the form of a bevel (this type of perforation is not shown in the drawing), or in the form of two bevels located symmetrically to each other, as shown in the drawing. The neck of the pipe 5 is provided with a cover 6. For pumping the contents of the working tank 2, the cover 6 is removed from the neck of the pipe 5. The hose of the sewer machine (not shown in the drawing) is fixed on the upper part of the pipe 5 and the pump is turned on. After pumping out the contents of the working tank 2, the pump is turned off, the hose of the scavenger is separated from the top of the pipe 5. The pipe 5 is closed by a cover 6.
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