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Intumescent firestop collars consist of a steel collar and an intumescent silicone strip suitable for 1.5”, 2”, 3” and 4” nominal trade size plastic pipes. Intumescent collars are fastened around plastic pipes where they penetrate fire-rated floor and walls. 1.5" Firestop Collar - F4P FSC-1.5 0380-7591 2" Firestop Collar - F4P FSC-2 0380-7594 3" Firestop Collar - F4P FSC-3 0380-7597 4" Firestop Collar - F4P FSC-4 0380-7600 Available through your local City Electric Supply. Click here to find a branch near you. Learn More