Vendor part 74116 is a 10 mm diameter GMP Tools cable blower accessory intended for micro fiber applications. It is dimensioned for 10 mm microduct so the blower can build and hold pressure behind small-count fiber optic cable without scoring the jacket on entry. Micro-scale blowing depends on tight tolerances at the head, which is why the accessory is specified by exact diameter rather than a range. A standard item for FTTH and drop-cable crews working microduct networks. Stocked by Millennium as part #527056.