This GMP Tools duct clamp, vendor part 89071, is machined for 2.00 in outside-diameter conduit and anchors the duct securely to the cable blower during jetting. The larger 2 in body suits main-line HDPE and SDR conduit runs where higher air volumes and longer blow distances put real load on the clamp interface. Positive mechanical grip prevents duct pullback and keeps the air seal intact so blow lengths stay predictable across the shot. Used with GMP cable blowers and hydraulic power units on fiber and broadband backbone builds. Millennium part #526399.