Abstract: The invention relates to a device for coupling a coolant supply to a roller (2), in particular for continuous casting installations, the roller (2) being mounted in a pillow block (4) by means of roller bearings (5) via journals (3) and wherein the roller can be supplied with a coolant via an axial roller borehole (6) guided through the journals (3), having a sealing unit which can be fixed to the roller journal (3) to couple it to the axial roller borehole (6) in a pressure-tight manner, preferably in form of an elastic sleeve, and a pillow block cover (9) which can be fixed to the pillow block (4) in order to cover the axial roller borehole (6) and which has at least one coolant duct (11; 12) being connectable to the coolant supply.