Abstract: In a conveyor module a conveyor is moving in a plane oriented at an angle relative to the vertical and transports articles through one or more treatment zones in a container. The conveyor is preferably of the endless type having two parallel runs. A number of holders on the conveyor provide, together with a guide and an article support below the conveyor, movable holding spaces for articles. Two or more conveyor modules can be arranged in series, allowing articles to move in an even flow from one to the other by means of gravity. By using, for example, a degreasing agent as a treatment agent an automatic degreasing device is obtained.