SpecSeal® Closet Flange Firestop Gaskets are one‑piece, molded‑rubber intumescent firestop gaskets engineered to install directly beneath 3-inch (76 mm) or 4-inch (102 mm) closet flanges, providing a fast, effective method for firestopping toilet flange penetrations. Each die‑cut gasket features perforated, removable inserts sized to accommodate a range of toilet flange diameters, ensuring a precise and secure fit. Traditional firestopping methods require installers to apply firestop materials around the pipe before setting the closet flange—often leading to improper recess depth and interference with the flange throat. Alternately, firestopping from the underside of the floor demands ladders or lifts, increasing time of install and jobsite complexity. SpecSeal Closet Flange Firestop Gaskets eliminate these challenges by offering a simple, time‑friendly, and code‑compliant solution that properly firestops the opening from the top side of floor. This design significantly reduces installation time while ensuring consistent fire resistance for toilet flange floor penetrations in commercial and residential construction.