Fire Barrier Self-Locking Pillow 3" X 6" X 9" Large

MMMFB369SL 3M FIRE BARRIER SELF-LOCKING PILLOWS ARE SELF-CONTAINED FIRESTOPS IDEAL FOR MEDIUM TO LARGE THROUGH PENETRATIONS. PILLOWS FEATURE INTERLOCKING STRIPS INSTALLERS CAN EASILY LOCK MULTIPLE PILLOWS TOGETHER TO ACHIEVE PRECISE FILL AND COMPRESSION WITH NO ADDITIONAL SUPPORT REQUIRED. INTUMESCENT FIRE-RATED PILLOWS ARE DESIGNED TO EXPAND DURING A FIRE LOCKING THEMSELVES AROUND VITAL COMPONENTS. MMM