Used to clear debris from conduit prior to proving or cable hauling, in some cases used to distribute more even coats of lube. Usually constructed containing rubber discs, but wire brush types also available.
Genuine Grundomat Soil Displacement Hammers. 45mm through to 130mm standard versions Excellently engineered and constructed from heavy duty components to provide a longer working life with less service intervals than other brands. Beware of imitations!
The NBN Proving Mandrel Set is a budget conscious solution offering a range of mandrels from 20mm through to 75mm. Note, sold as a set only. Unlike the standard proving mandrels they are not pre-roped and swaged.