Seals off the path of fire, smoke and superheated gases while providing support and protection for electrical, telephone, and data cables. Features Economical - Significant material and labor savings vs. field fabrication Ready to Install - No additional parts or fabrication required. Conveniently sized for up to 10" (250 mm) thick barriers No External Firestop Seal Required - Factory supplied intumescent firestop gasket eliminates the need to seal the circumference of the steel sleeve at its egress from each side of barrier UL Classified and Code Compliant - Each kit designed to provide up to a 2 hour F Rating in accordance with UL System requirements. Assures code compliance every time For Rated and Non-Rated Barriers - Putty seal impedes the passage of fire, smoke, superheated gases, and particulate dust, and minimizes noise transmission