3M Fire Barrier Plug is a replacement foam plug for 2-inch Round 3M Fire Barrier Pass-Through Device. This product works together with the device to help prevent the spread of smoke and fire. These foam plugs enhance the cold and hot smoke seal and help the system achieve UL classified L-Rating.Enhanced Seal for Fire Prevention Engineered for 2-inch Round 3M Fire Barrier Pass-Through Device, our 3M Fire Barrier Plug is a replacement foam plug. These foam plugs work together with the pass-through device to help prevent the spread of smoke and fire. We designed this product to enhance the seal and help the device achieve UL classified L-Rating. Recommended Applications 3M Fire Barrier Plug is used with a system where typical applications include: • Blank openings • Metal pipe • Cables • Cable tray • Insulated pipe • Combination penetrations through concrete floor/wall • Gypsum wall board assemblies Engineered to Provide Protection Ready to work together with 2-inch Round 3M Fire Barrier Pass-Through Device, 3M Fire Barrier Plug helps this system prevent the spread of smoke and fire. Enjoy the innovative design of this product that is engineered to offer resilient results.