Abstract: A hose for conveying free-flowing materials, such as coating powder made of an electrically non-conductive or poor conductive material is characterized in that a wall member of an electrically conductive material is installed into the wall of the hose, said wall member extending radially across the cross section of the wall and axially across the length of the hose, and being grounded towards the outside and having an approximately sector-shaped cross section as in a welding seam in a manner so that on the one hand a favorable discharge of undesired electric charges is achieved and on the other hand a caking at the inner wall of the hose is virtually excluded.