3M™ fire barrier plug is a replacement foam plug for 2 in 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. 3M™ fire barrier plug are designed for firestop applications in walls and floors. These are re-enterable, repairable and reusable. Installation is easy, saving both time and labor. Our foam plugs are paintable with primer and have no cure time. 3M™ fire barrier rated foam FIP plug is rated for up to 2 hr.