The gun has a connection pipe (14) with an end connected to a conveying pipe of a nozzle assembly (3). A water outlet pipe (15) runs in the conveying pipe such that air is supplied. A bent pipe (34) attached to an opening of a casing (32) is made from a non-flexible material e.g. metal or plastic. The casing and a bearing are arranged at the conveying pipe. The conveying and bent pipes are arranged horizontally, and the outlet pipe runs over the conveying pipe till to an end opening of the bent pipe. The bearing is arranged in the casing such that the casing is rotated on the conveying pipe.
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