Abstract: A coupling particularly suited for brushes for tube cleaning operations includes interfitted shaft and brush coupling members retained by a locking mechanism in axial alignment for rotation in tube cleaning operations. The shaft and brush coupling interfit and the locking mechanism are suited for rapid mounting and replacement of the brush coupling. In a preferred form the locking mechanism comprises a sleeve and spring in nested reglation to each other mounted axially of the coupling. A brush coupling adapter may form part of the coupling for receiving a standard brush element.