10.5-Ounce Cartridge Intumescent Firestop Compound, Water-Based
https://nsiindustries.com/product/10-5-ounce-cartridge-intumescent-firestop-compound-water-based/
Bridgeport Commercial Intumescent Firestop is a quality non-combustible fire, smoke and draft sealant for penetrations and construction voids. Adheres to most construction materials. Built to the high standards of Bridgeport for professional users.