Service penetration seals are passive fire protection systems designed to maintain the fire resistance of building element or section - wall or floor - where services such as cables, cable trays, pipes or ventilation ducts pass through them. our solutions are easy to use and help you ensure safety, efficiency and operational reliability through all phases of your construction project. You can review our different products below. SLIPSIL Sealing Plugs are an ideal solution for the fire-safe, gas and / or watertight sealing of penetrations carrying single or. Cables, cable bundles, conduits, bundles of conduits, empty pipes, cable trays and cable ladders may also pass through penetration seals in walls and floors and should be taken into consideration during all phases of design and application. The WSP system utilizes a powder coated or galvanized steel frame that encompasses the entire tray or duct at the point of penetration.