GMP Tools duct clamp 89079 grips 22 mm microduct at the blower head so the duct cannot slip or blow back under working air pressure. Sized specifically for 22 mm HDPE microduct, it holds a tight, repeatable seal while fiber optic cable is jetted downstream, protecting both the duct wall and the cable jacket. Fiber construction crews running Tornado-class blowers keep this clamp in the kit as a matched pairing with the corresponding 22 mm duct seal. Stocked at Millennium as part #566826 for telecom and broadband contractors.