Firestop Plug Fire Rating 2 hr Fire Resistance Type Intumescent Firestop Type Plug Interlocking No Overall Height 3.1 in Overall Length 4.64 in Overall Width 4.64 in Color Red Expansion Temperature 350 Degrees F Expansion Volume 10X Features No Expiration Date For Material Type Concrete Gypsum For Use On Blank Openings Cables Conduit Stubs and Sleeves Maximum Service Temperature 130 Degrees F Plug Diameter 4 in Standards ASTM E814 CAN/ULC-S115 UL 1479