OPERATOR WAS REMOVING A WATER HOSE THAT WAS WEDGED IN PLACE ON A DRAG BOX TO FLUSH SCREEN DRAIN. WHEN THE OPERATOR WENT TO REMOVE THE HOSE, THE CHAIN JUMPED AND THE DRAG CAUGHT A HOLD OF OPERA TOR'S GLOVE AND PULLED THE OPERATOR'S HAND BETWEEN THE DRAG AND THE SIDE WALL OF THE DRAG-BOX, CRUSHING AND BREAKING TWO FINGERS ON HIS LEFT HAND.