17 STOPPING MATERIALS AND DEVICES, STUFFING MATERIALS AND DEVICES, INSULATING MATERIALS AND DEVICES, PACKING MATERIALS AND DEVICES, TIGHTNESS RIBBONS FOR PIPE JOINTS, PACKINGS FOR PIPES AND CYLINDERS, PACKING FOR MACHINES, AIR PUMPS, JACKS, DISTRIBUTORS, PIPES AND PIPING, EXPANSION JOINT AND JOINT PLATES, PACKINGS AND STUFFINGS FOR STUFING BOXES