The 6100 Series B-6109-20 1-1/4 inch Dust Plug is a brass component designed to safeguard your fittings and system from the damaging effects of dirt and dust. These brass plugs serve as a protective barrier, extending the life of your fittings by sealing them off from external contaminants. Whether used in industrial or everyday applications, these dust plugs ensure the longevity of your equipment.