Cable Transit Sealing Systems such as Hawke Cable Transit Sealing Systems and Roxtec Modular Cable Transit Systems consist of modular components that together seal the aperture through which cables enter or leave a harsh & industrial area.

The main components of a Cable Transit Sealing System include:

Transit Frames

A transit frame is inserted into the wall (or other barrier) to create a hole which is then filled with transit blocks, cable modules, wedges and stayplates. Lubricants are also added for a better seal, as well as smoke-proofing and fire-proofing.

Cable transit frames can be welded or bolted into place, to suit different harsh & industrial environments. Round transit frames are also available, and are often used in marine applications.

Cable Modules/Transit Blocks

Cable modules have a central aperture through which the cable passes, but the surrounding material conforms to the thickness of the cable so that no gap is left. The module is then inserted into a suitable transit frame.

Transit blocks with no aperture – known as Solid Modules in Roxtec Modular Cable Transit Systems, and Blank Filler Blocks in Hawke Cable Transit Sealing Systems – can fill any remaining unused spaces until they are needed for newly installed cables at a later date.


The Roxtec Wedge is used to compress Roxtec Modular Cable Transit Systems, while the Hawke Compression Tool is used on Hawke Cable Transit Sealing Systems.

Both apply compression to the cable modules installed in the relevant transit frame, before an end packer or stayplate is added, to keep the system under the appropriate pressure to ensure a tight seal in and around the transit blocks, with the help of any lubricants that have been applied.