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Cable Overblowing Junction box

The CBS Cable Overblowing Junction Box has been designed to install a new cable into an existing occupied sub-duct.

The Cable Overblowing Junction Box comprises a robust aluminium base and lid that form a pressurised air chamber into which one end of an existing occupied sub-duct can be attached.

The existing cable exits the Cable Overblowing Junction Box through an opening that has 3 cable seal slots, one of which will house the seal to suit the size of the existing cable. The third branch is then connected to a CBS Cable Blowing Machine via a short slave length of tube for the installation of the extra cable.

A range of Overblowing junction box collets and seals are available to suit the outside diameter of the existing sub-duct, existing cable, cable to be installed and slave length of tube for cable to be installed.

Air is fed into the Cable Overblowing Junction Box directly via a J-Mac coupling on the lid of the box. Other couplings and adaptors are available on request, speak to one of the sales team for more information.

Product No: C-1253-JBOX

Cable Overblowing Junction box


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The maximum diameter of a new cable / tube(s) for installation is dependent on the diameter of the existing cable and duct bore.

It is the responsibility of the operator to ensure that the cable / tube(s) to be installed are compatible with the existing sub-duct and installed cable configuration.

  • Existing Cable Range:           9-20 mm O.D
  • Existing Duct Range:            25-50 mm O.D
  • Installing Cable Range:        5-11 mm O.D
  • Installing Tube Range:         5-18 mm O.D
  • Max operating pressure:    15 Bar

Please contact a member of the CBS Sales team for the additional interchangeable parts. Other sizes can be manufactured upon request.