Hawke Transit System Sealing system for cables and pipes - reliable and safe A means to maintain the integrity of a firewall, bulkhead or deck through which cables and pipes pass. The Hawke Transit System is the most user friendly modular sealing device on the market. It also boasts the best system compression. The system does not need any on-site modifications thus decreasing installation time by over 50%. The cable blocks incorporate a colour coding system to minimise incorrect installation. Our cable blocks have five sealing faces so that the best possible grip is achieved. The cable range is also marked on the blocks to aid with on-site inspectability. We can offer custom frames and blocks to suit the most demanding applications