Duct seal for pressurisable duct.

摘要

A duct seal for sealing a cable such as a fibre optic cable duct comprises: (a) a first hollow portion which can be turned inside-out to engage a duct carrying a cable; (b) a second hollow portion which can be recovered into engagement with the cable, the open end of the second portion through which the cable passes facing the duct such that pressure within the duct tends to increase engagement between the second portion and the cable; (c) means which allows relative axial movement between the cable and the duct; (d) a sealing material on an external surface of the first portion. A pressure resistant seal is therefore made to the cable that allows axial movement.