Unique Fire Stop Products manufactures UL-classified through-penetration sleeve systems for telecomm cables for fire barrier applications. Retrofit application products include the Split Sleeve System, for cable penetration violations in walls rated up to four hours and floors up to three hours. The system can be installed around existing violations without cable removal. The system comes complete with intumescent putty. The Bulkhead system features special order plates that are screwed to the wall studs and sealed to match the barrier's hourly rating. For new installations, the Smooth Penetrator for horizontal cable installations in walls rated up to two hours makes for a neat, clean, an approved firewall penetration. The Threaded Penetrator is for horizontal cable installations in walls rated up to four hours and vertical penetrations up to three-hour rated floors. Membrane penetrations are used for routing cables inside of a fire-rated wall for walls rated up to one hour. Unique Fire Stop Products.