The Fremco Cleaning Sponge, 60 mm (103-2060060, Millennium part 588717) loads into MultiFlow and MicroFlow blower duct paths ahead of a cable pull to scrub debris and moisture out of the duct before jetting fiber. Running a sponge through first cuts drag on the cable during the blow and lowers the odds of a stalled run in dirty or newly installed duct. This pack of 10 sponges is sized for 60 mm duct on Fremco blower platforms already in the field. Stock it alongside other sponge sizes and blowing tips for the full duct-prep kit.