Prompt: Draw an oil-water separator behind the wall of an office building. The oil-water separator has a rectangular parallelepiped structure and is made of 304 stainless steel. A pipe comes out of the room of the office building and enters the oil-water separator. The oil-water separator separates the pipes in the office building. After treatment, the sewage is discharged into the sewer manhole cover through a pipe. It is created using realistic techniques. The main view mainly shows the oil-water separator. The office building only shows the wall with the drainage pipe.