3M Fire Barrier Sealant IC 15WB+ 1.88-in to 1.88-in Dia x 11.25-in to 11.25-in H Firestop Caulk/Sealant in the Firestop Products & Systems department at Lowes.com
3M, Caulk, Red, Fire Barrier Sealant - 5Z337|CP-25WB+10.1OZ - Grainger
3M 10.1 fl. oz. Red Fire Barrier CP 25WB Plus Sealant CP25WB+10 - The Home Depot