Used to seal the space between the duct and the cable in a ductA plug has a dummy rod so it can also be used to close a duct without a cable insideThe plug is divisible so it can be installed after blowing a cable in the ductFeatures:

Watertight and airtightSimple installation around existing cablesSeals all types of inner ductsEasy to retrofitWide cable sealing rangeInstall and remove by hand