The Fremco Cleaning Sponge, 18 mm (103-2018060, Millennium part 534383) is sized for small-diameter microduct, clearing dust and debris ahead of a fiber cable blow so the jet run doesn't hang up on grit inside the duct. The 50-count pack suits crews prepping many short duct segments on a single microduct build, such as multi-dwelling or drop installations. It runs on Fremco MultiFlow blower systems already deployed in the field. Pair it with matching blowing tips and gaskets for a complete small-duct jetting kit.