A TOOL FOR CLEANING THE ANNULAR GASKET-SEATING GROOVE IN A CYLINDRICAL OPENING IN AN AIR COUPLING MEMBER, WITH THE TOOL HAVING A RECESSED BODY WITH A CYLINDRICAL FRONT PILOT PART AND A REAR HANDLE PART, A WIRE BRUSH ASSEMBLY GUIDED FOR MOVEMENT IN THE BODY RECESS AND INCLUDING A WIRE BRUSH PROJECTING RADIALLY OUTWARDLY FROM THE PILOT PART AND RETRACTABLE THEREINTO, AND A PRELOADED SPRING IN THE BODY RECESS NORMALLY URGING THE BRUSH ASSEMBLY WITH ITS WIRE BRUSH INTO OUTWARD PROJECTION FROM THE PILOT PART OF THE TOOL BODY.