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Great Stuff, 12 OZ, Fire Block Insulating Foam Sealant, Helps Impede The Spread Of Fire & Smoke Through Service Penetrations, Such As Pipes, Cables & Ducts, Tested According To ASTM E84, ASTM E814 Ul1715/ Recognized As An Alternative Fire Blocking Material, Bright Orange Colored Foam For Visual Inspection, Fills, Seals & Insulates Gaps Up To 3/4" With An Airtight, Water Resistant Bond.